Linear IgA disease is a rare acquired autoimmune blistering condition that can affect your child’s skin and moist lining tissues, known as mucous membranes. These include the mouth, eyes and genital area. In children, the condition may also be called chronic bullous disease of childhood or linear IgA bullous dermatosis.<\/p>\n\n\n\n
The name refers to the line of immunoglobulin A, or IgA, antibodies found along the basement membrane zone, where the outer layer of the skin attaches to the tissue beneath it. These antibodies cause inflammation and weaken this attachment, allowing fluid to collect and form blisters. Linear IgA disease is not an infection and cannot be passed to another person.<\/p>\n\n\n\n
Why Does the Condition Cause Blisters?<\/strong><\/h2>\n\n\n\nIn linear IgA disease, your child’s immune system produces IgA antibodies that attach to proteins within the basement membrane zone. This triggers inflammation and weakens the connection between the outer layer of the skin and the tissue beneath it.<\/p>\n\n\n\n
Fluid can then collect within this weakened area and form tense blisters beneath the outer layer of the skin. The blisters may break because of scratching, friction or everyday movement, leaving sore, eroded or crusted areas that require gentle skin care while they heal.<\/p>\n\n\n\n
How Common Is Linear IgA Disease in Children?<\/strong><\/h2>\n\n\n\nLinear IgA disease is rare compared with common childhood skin conditions such as eczema, impetigo and chickenpox. However, among the small group of autoimmune blistering diseases that affect children, linear IgA disease is the most commonly reported.<\/p>\n\n\n\n
The condition most often begins during the preschool years, although it can affect children of any age. You should remember that your child’s age alone cannot confirm the diagnosis, and a dermatologist will assess their symptoms and carry out the appropriate tests if needed.<\/p>\n\n\n\n
What Does the Rash Look Like?<\/strong><\/h2>\n\n\n\nThe rash usually appears as small, firm blisters filled with clear fluid, although some may contain a small amount of blood. You may notice the blisters appearing on their own, in groups, or forming a ring around older blisters or crusted areas.<\/p>\n\n\n\n
One of the most recognisable features is the “string of pearls”<\/strong> pattern, where new blisters form around older ones. You should remember that not every child develops this appearance, so a dermatologist will assess your child’s rash and arrange further tests if needed.<\/p>\n\n\n\nWhich Parts of the Body Can Be Affected?<\/strong><\/h2>\n\n\n\nBlisters commonly appear on your child’s lower abdomen, groin, buttocks, upper thighs, or around the mouth, but they can develop almost anywhere on the body. You may notice that the rash is limited to a few areas or spreads across several parts of your child’s skin.<\/p>\n\n\n\n
Your child may experience intense itching or a burning sensation, making them irritable or reluctant to wash or get dressed. You should also know that the severity of the condition can vary, with some children having occasional flare-ups while others develop more widespread blisters.<\/p>\n\n\n\n
Can the Mouth, Eyes or Genital Area Be Involved?<\/strong><\/h2>\n\n\n\n![\"\"](\"https:\/\/www.london-dermatology-centre.co.uk\/blog\/wp-content\/uploads\/2026\/07\/Imagess-4-1024x559.png\")
<\/figure>\n\n\n\nLinear IgA disease can also affect your child’s mouth, eyes, or genital area, not just the skin. You may notice painful blisters or ulcers that make eating, drinking, brushing teeth, or passing urine uncomfortable.<\/p>\n\n\n\n
If your child develops red, painful, or watery eyes, becomes sensitive to light, or has any changes in their vision, you should seek medical advice promptly. Early treatment can help prevent complications and protect your child’s eyes and other affected areas.<\/p>\n\n\n\n
What Causes Linear IgA Disease?<\/strong><\/h2>\n\n\n\nIn most children, doctors cannot identify a single cause of linear IgA disease, so you may not find a clear reason why your child developed the condition. It occurs when the immune system mistakenly attacks healthy skin, leading to blister formation.<\/p>\n\n\n\n
In some cases, infections or certain medicines may act as a trigger, although this is less common in children. You should tell your dermatologist about any medicines your child has recently taken, but you should never stop a prescribed medicine without medical advice.<\/p>\n\n\n\n
Is Linear IgA Disease Contagious or Inherited?<\/strong><\/h2>\n\n\n\nLinear IgA disease is not contagious, so your child cannot pass it to other children through close contact, sharing items, or attending school. You can continue normal family interactions without worrying about spreading the condition.<\/p>\n\n\n\n
The condition is also not usually inherited, and having one child with linear IgA disease does not mean another child will develop it. You should not blame yourself, as the condition is not caused by your child’s diet, hygiene, clothing, or the way you care for them.<\/p>\n\n\n\n
When Should You Seek Medical Advice?<\/strong><\/h2>\n\n\n\nArrange a medical assessment if your child develops unexplained, recurring or widespread blisters, particularly when new lesions continue to appear, the skin becomes increasingly painful or there are signs of infection such as spreading redness, warmth, swelling, discharge or fever.<\/p>\n\n\n\n
Request urgent same-day medical advice if your child develops eye redness, eye pain, light sensitivity or visual changes, or if painful mouth or genital lesions interfere with eating, drinking or passing urine. Call 999 if your child has severe breathing difficulty, cannot swallow their saliva, becomes unusually drowsy or unresponsive, or develops rapidly worsening blistering while appearing seriously unwell.<\/p>\n\n\n\n
What Happens During a Specialist Dermatology Assessment?<\/strong><\/h2>\n\n\n\nDuring the appointment, the dermatologist will ask about your child’s blisters, including when they started, how they have changed, and whether they cause itching, pain, or burning. You should also mention any mouth, eye, or genital symptoms, recent infections, medicines, and previous treatments.<\/p>\n\n\n\n
The dermatologist will examine your child’s skin and may ask to see photographs taken when fresh blisters were present. Clear photographs can provide useful information about how the rash developed, but photographs alone cannot confirm the diagnosis because several blistering conditions can look similar.<\/p>\n\n\n\n
Clinical Tip<\/strong><\/p>\n\n\n\nTake clear photographs when new blisters appear, including one close-up image and one showing where the rash is located. Keep a brief record of recent infections, new medicines and when each flare began, but do not stop a prescribed medicine unless the dermatologist or prescribing clinician advises you to do so.<\/p>\n\n\n\n
How Is Linear IgA Disease Diagnosed?<\/strong><\/h2>\n\n\n\nLinear IgA disease usually needs a skin biopsy because several childhood blistering conditions can look similar. The dermatologist will normally select skin close to a fresh blister for direct immunofluorescence and may take another sample from the blistered area for routine microscopic examination.<\/p>\n\n\n\n
The direct immunofluorescence test looks for a linear pattern of IgA along the basement membrane zone. If the result is negative or unclear but clinical suspicion remains high, the dermatologist may review the biopsy site, repeat the test or arrange additional specialist investigations.<\/p>\n\n\n\n
Evidence Note<\/strong><\/p>\n\n\n\nDirect immunofluorescence is considered the key test for linear IgA disease because it can demonstrate the characteristic linear IgA deposits along the basement membrane zone. The sample is normally taken from skin beside a fresh blister rather than from the centre of an old or eroded lesion, as damaged skin may be less suitable for accurate testing; when suspicion remains high despite an unclear result, repeat biopsy or further specialist tests may be considered (Shin et al., 2021).<\/p>\n\n\n\n
Will My Child Need Other Tests?<\/strong><\/h2>\n\n\n\n![\"\"](\"https:\/\/www.london-dermatology-centre.co.uk\/blog\/wp-content\/uploads\/2026\/07\/Imagess-5-1024x559.png\")
<\/figure>\n\n\n\nYour child may need blood tests to support the assessment or check their overall health, but these tests alone cannot confirm linear IgA disease. The dermatologist will decide which investigations are needed based on your child’s symptoms rather than ordering every possible test.<\/p>\n\n\n\n
You should tell the dermatologist if your child has symptoms such as ongoing diarrhoea, abdominal pain, poor growth, or unexplained weight loss, as these may require further assessment. The results of all the tests will help your child’s specialist make an accurate diagnosis and plan the most appropriate treatment.<\/p>\n\n\n\n
How Is Linear IgA Disease Treated?<\/strong><\/h2>\n\n\n\nTreatment is tailored to the extent of your child’s blistering, itching and mucosal involvement. A topical corticosteroid may be sufficient for limited skin disease, while more extensive or persistent disease commonly requires an oral medicine. Dapsone is frequently used because it can reduce new blister formation, but it is not suitable for every child.<\/p>\n\n\n\n
If dapsone cannot be used, does not adequately control the disease or causes unacceptable side effects, the specialist may consider another treatment, such as an alternative sulphonamide, an oral corticosteroid, an antibiotic with anti-inflammatory effects or another immune-modifying medicine. Treatment is selected individually because controlled paediatric evidence remains limited and the possible benefits must be balanced against side effects and monitoring requirements.<\/p>\n\n\n\n
What Should You Know About Dapsone Monitoring?<\/strong><\/h2>\n\n\n\nBefore starting dapsone, the specialist will usually arrange blood tests, including a full blood count, liver and kidney function tests and a test for glucose-6-phosphate dehydrogenase deficiency. Further blood tests are required after treatment begins because dapsone can affect blood cells and, less commonly, the liver or other organs. The exact schedule should follow the paediatric dermatology team’s protocol.<\/p>\n\n\n\n
Seek urgent medical advice if your child develops a fever, sore throat, mouth ulcers, unusual bruising or bleeding, marked tiredness, breathlessness, blue or grey lips, yellowing of the skin or eyes, dark urine, swollen glands or a widespread new rash. Follow the emergency instructions provided by the prescribing team.<\/p>\n\n\n\n
The British Association of Dermatologists advises stopping dapsone immediately if an allergic reaction is suspected and seeking advice from the GP or dermatologist as soon as possible. For other concerning symptoms, contact the prescribing team urgently and follow its instructions. Do not restart dapsone or alter the dose unless a qualified clinician advises you to do so.<\/p>\n\n\n\n
UK Guidance Note: Dapsone Safety<\/strong><\/p>\n\n\n\nBritish dermatology guidance advises checking the full blood count, liver function and kidney function before dapsone treatment, together with assessment for G6PD deficiency. Frequent blood tests are required after treatment begins, with the schedule adjusted according to your child’s results, dose and specialist paediatric protocol. You should also receive clear written advice about warning symptoms, when to stop treatment and whom to contact if your child becomes unwell.<\/p>\n\n\n\n
How Can You Care for Your Child\u2019s Skin?<\/strong><\/h2>\n\n\n\n![\"\"](\"https:\/\/www.london-dermatology-centre.co.uk\/blog\/wp-content\/uploads\/2026\/07\/Imagess-6-1024x559.png\")
<\/figure>\n\n\n\nFollow the dermatology team’s instructions for cleaning, dressing and protecting open or crusted areas. Loose clothing, short fingernails and suitable non-perfumed skin products may reduce friction and scratching. Do not burst intact blisters or apply antiseptics, antibiotics, corticosteroids or alternative remedies unless the clinical team recommends them.<\/p>\n\n\n\n
Ask the team for advice about bathing, swimming, school attendance and dressings, particularly when blisters are widespread or affect the groin. Seek medical advice if the skin becomes increasingly red, warm, swollen or painful, produces discharge or is accompanied by fever.<\/p>\n\n\n\n
Myth vs Fact<\/strong><\/h2>\n\n\n\n
Linear IgA disease is rare compared with common childhood skin conditions such as eczema, impetigo and chickenpox. However, among the small group of autoimmune blistering diseases that affect children, linear IgA disease is the most commonly reported.<\/p>\n\n\n\n
The condition most often begins during the preschool years, although it can affect children of any age. You should remember that your child’s age alone cannot confirm the diagnosis, and a dermatologist will assess their symptoms and carry out the appropriate tests if needed.<\/p>\n\n\n\n
What Does the Rash Look Like?<\/strong><\/h2>\n\n\n\nThe rash usually appears as small, firm blisters filled with clear fluid, although some may contain a small amount of blood. You may notice the blisters appearing on their own, in groups, or forming a ring around older blisters or crusted areas.<\/p>\n\n\n\n
One of the most recognisable features is the “string of pearls”<\/strong> pattern, where new blisters form around older ones. You should remember that not every child develops this appearance, so a dermatologist will assess your child’s rash and arrange further tests if needed.<\/p>\n\n\n\nWhich Parts of the Body Can Be Affected?<\/strong><\/h2>\n\n\n\nBlisters commonly appear on your child’s lower abdomen, groin, buttocks, upper thighs, or around the mouth, but they can develop almost anywhere on the body. You may notice that the rash is limited to a few areas or spreads across several parts of your child’s skin.<\/p>\n\n\n\n
Your child may experience intense itching or a burning sensation, making them irritable or reluctant to wash or get dressed. You should also know that the severity of the condition can vary, with some children having occasional flare-ups while others develop more widespread blisters.<\/p>\n\n\n\n
Can the Mouth, Eyes or Genital Area Be Involved?<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\nLinear IgA disease can also affect your child’s mouth, eyes, or genital area, not just the skin. You may notice painful blisters or ulcers that make eating, drinking, brushing teeth, or passing urine uncomfortable.<\/p>\n\n\n\n
If your child develops red, painful, or watery eyes, becomes sensitive to light, or has any changes in their vision, you should seek medical advice promptly. Early treatment can help prevent complications and protect your child’s eyes and other affected areas.<\/p>\n\n\n\n
What Causes Linear IgA Disease?<\/strong><\/h2>\n\n\n\nIn most children, doctors cannot identify a single cause of linear IgA disease, so you may not find a clear reason why your child developed the condition. It occurs when the immune system mistakenly attacks healthy skin, leading to blister formation.<\/p>\n\n\n\n
In some cases, infections or certain medicines may act as a trigger, although this is less common in children. You should tell your dermatologist about any medicines your child has recently taken, but you should never stop a prescribed medicine without medical advice.<\/p>\n\n\n\n
Is Linear IgA Disease Contagious or Inherited?<\/strong><\/h2>\n\n\n\nLinear IgA disease is not contagious, so your child cannot pass it to other children through close contact, sharing items, or attending school. You can continue normal family interactions without worrying about spreading the condition.<\/p>\n\n\n\n
The condition is also not usually inherited, and having one child with linear IgA disease does not mean another child will develop it. You should not blame yourself, as the condition is not caused by your child’s diet, hygiene, clothing, or the way you care for them.<\/p>\n\n\n\n
When Should You Seek Medical Advice?<\/strong><\/h2>\n\n\n\nArrange a medical assessment if your child develops unexplained, recurring or widespread blisters, particularly when new lesions continue to appear, the skin becomes increasingly painful or there are signs of infection such as spreading redness, warmth, swelling, discharge or fever.<\/p>\n\n\n\n
Request urgent same-day medical advice if your child develops eye redness, eye pain, light sensitivity or visual changes, or if painful mouth or genital lesions interfere with eating, drinking or passing urine. Call 999 if your child has severe breathing difficulty, cannot swallow their saliva, becomes unusually drowsy or unresponsive, or develops rapidly worsening blistering while appearing seriously unwell.<\/p>\n\n\n\n
What Happens During a Specialist Dermatology Assessment?<\/strong><\/h2>\n\n\n\nDuring the appointment, the dermatologist will ask about your child’s blisters, including when they started, how they have changed, and whether they cause itching, pain, or burning. You should also mention any mouth, eye, or genital symptoms, recent infections, medicines, and previous treatments.<\/p>\n\n\n\n
The dermatologist will examine your child’s skin and may ask to see photographs taken when fresh blisters were present. Clear photographs can provide useful information about how the rash developed, but photographs alone cannot confirm the diagnosis because several blistering conditions can look similar.<\/p>\n\n\n\n
Clinical Tip<\/strong><\/p>\n\n\n\nTake clear photographs when new blisters appear, including one close-up image and one showing where the rash is located. Keep a brief record of recent infections, new medicines and when each flare began, but do not stop a prescribed medicine unless the dermatologist or prescribing clinician advises you to do so.<\/p>\n\n\n\n
How Is Linear IgA Disease Diagnosed?<\/strong><\/h2>\n\n\n\nLinear IgA disease usually needs a skin biopsy because several childhood blistering conditions can look similar. The dermatologist will normally select skin close to a fresh blister for direct immunofluorescence and may take another sample from the blistered area for routine microscopic examination.<\/p>\n\n\n\n
The direct immunofluorescence test looks for a linear pattern of IgA along the basement membrane zone. If the result is negative or unclear but clinical suspicion remains high, the dermatologist may review the biopsy site, repeat the test or arrange additional specialist investigations.<\/p>\n\n\n\n
Evidence Note<\/strong><\/p>\n\n\n\nDirect immunofluorescence is considered the key test for linear IgA disease because it can demonstrate the characteristic linear IgA deposits along the basement membrane zone. The sample is normally taken from skin beside a fresh blister rather than from the centre of an old or eroded lesion, as damaged skin may be less suitable for accurate testing; when suspicion remains high despite an unclear result, repeat biopsy or further specialist tests may be considered (Shin et al., 2021).<\/p>\n\n\n\n
Will My Child Need Other Tests?<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\nYour child may need blood tests to support the assessment or check their overall health, but these tests alone cannot confirm linear IgA disease. The dermatologist will decide which investigations are needed based on your child’s symptoms rather than ordering every possible test.<\/p>\n\n\n\n
You should tell the dermatologist if your child has symptoms such as ongoing diarrhoea, abdominal pain, poor growth, or unexplained weight loss, as these may require further assessment. The results of all the tests will help your child’s specialist make an accurate diagnosis and plan the most appropriate treatment.<\/p>\n\n\n\n
How Is Linear IgA Disease Treated?<\/strong><\/h2>\n\n\n\nTreatment is tailored to the extent of your child’s blistering, itching and mucosal involvement. A topical corticosteroid may be sufficient for limited skin disease, while more extensive or persistent disease commonly requires an oral medicine. Dapsone is frequently used because it can reduce new blister formation, but it is not suitable for every child.<\/p>\n\n\n\n
If dapsone cannot be used, does not adequately control the disease or causes unacceptable side effects, the specialist may consider another treatment, such as an alternative sulphonamide, an oral corticosteroid, an antibiotic with anti-inflammatory effects or another immune-modifying medicine. Treatment is selected individually because controlled paediatric evidence remains limited and the possible benefits must be balanced against side effects and monitoring requirements.<\/p>\n\n\n\n
What Should You Know About Dapsone Monitoring?<\/strong><\/h2>\n\n\n\nBefore starting dapsone, the specialist will usually arrange blood tests, including a full blood count, liver and kidney function tests and a test for glucose-6-phosphate dehydrogenase deficiency. Further blood tests are required after treatment begins because dapsone can affect blood cells and, less commonly, the liver or other organs. The exact schedule should follow the paediatric dermatology team’s protocol.<\/p>\n\n\n\n
Seek urgent medical advice if your child develops a fever, sore throat, mouth ulcers, unusual bruising or bleeding, marked tiredness, breathlessness, blue or grey lips, yellowing of the skin or eyes, dark urine, swollen glands or a widespread new rash. Follow the emergency instructions provided by the prescribing team.<\/p>\n\n\n\n
The British Association of Dermatologists advises stopping dapsone immediately if an allergic reaction is suspected and seeking advice from the GP or dermatologist as soon as possible. For other concerning symptoms, contact the prescribing team urgently and follow its instructions. Do not restart dapsone or alter the dose unless a qualified clinician advises you to do so.<\/p>\n\n\n\n
UK Guidance Note: Dapsone Safety<\/strong><\/p>\n\n\n\nBritish dermatology guidance advises checking the full blood count, liver function and kidney function before dapsone treatment, together with assessment for G6PD deficiency. Frequent blood tests are required after treatment begins, with the schedule adjusted according to your child’s results, dose and specialist paediatric protocol. You should also receive clear written advice about warning symptoms, when to stop treatment and whom to contact if your child becomes unwell.<\/p>\n\n\n\n
How Can You Care for Your Child\u2019s Skin?<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\nFollow the dermatology team’s instructions for cleaning, dressing and protecting open or crusted areas. Loose clothing, short fingernails and suitable non-perfumed skin products may reduce friction and scratching. Do not burst intact blisters or apply antiseptics, antibiotics, corticosteroids or alternative remedies unless the clinical team recommends them.<\/p>\n\n\n\n
Ask the team for advice about bathing, swimming, school attendance and dressings, particularly when blisters are widespread or affect the groin. Seek medical advice if the skin becomes increasingly red, warm, swollen or painful, produces discharge or is accompanied by fever.<\/p>\n\n\n\n
Myth vs Fact<\/strong><\/h2>\n\n\n\n
Which Parts of the Body Can Be Affected?<\/strong><\/h2>\n\n\n\nBlisters commonly appear on your child’s lower abdomen, groin, buttocks, upper thighs, or around the mouth, but they can develop almost anywhere on the body. You may notice that the rash is limited to a few areas or spreads across several parts of your child’s skin.<\/p>\n\n\n\n
Your child may experience intense itching or a burning sensation, making them irritable or reluctant to wash or get dressed. You should also know that the severity of the condition can vary, with some children having occasional flare-ups while others develop more widespread blisters.<\/p>\n\n\n\n
Can the Mouth, Eyes or Genital Area Be Involved?<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\nLinear IgA disease can also affect your child’s mouth, eyes, or genital area, not just the skin. You may notice painful blisters or ulcers that make eating, drinking, brushing teeth, or passing urine uncomfortable.<\/p>\n\n\n\n
If your child develops red, painful, or watery eyes, becomes sensitive to light, or has any changes in their vision, you should seek medical advice promptly. Early treatment can help prevent complications and protect your child’s eyes and other affected areas.<\/p>\n\n\n\n
What Causes Linear IgA Disease?<\/strong><\/h2>\n\n\n\nIn most children, doctors cannot identify a single cause of linear IgA disease, so you may not find a clear reason why your child developed the condition. It occurs when the immune system mistakenly attacks healthy skin, leading to blister formation.<\/p>\n\n\n\n
In some cases, infections or certain medicines may act as a trigger, although this is less common in children. You should tell your dermatologist about any medicines your child has recently taken, but you should never stop a prescribed medicine without medical advice.<\/p>\n\n\n\n
Is Linear IgA Disease Contagious or Inherited?<\/strong><\/h2>\n\n\n\nLinear IgA disease is not contagious, so your child cannot pass it to other children through close contact, sharing items, or attending school. You can continue normal family interactions without worrying about spreading the condition.<\/p>\n\n\n\n
The condition is also not usually inherited, and having one child with linear IgA disease does not mean another child will develop it. You should not blame yourself, as the condition is not caused by your child’s diet, hygiene, clothing, or the way you care for them.<\/p>\n\n\n\n
When Should You Seek Medical Advice?<\/strong><\/h2>\n\n\n\nArrange a medical assessment if your child develops unexplained, recurring or widespread blisters, particularly when new lesions continue to appear, the skin becomes increasingly painful or there are signs of infection such as spreading redness, warmth, swelling, discharge or fever.<\/p>\n\n\n\n
Request urgent same-day medical advice if your child develops eye redness, eye pain, light sensitivity or visual changes, or if painful mouth or genital lesions interfere with eating, drinking or passing urine. Call 999 if your child has severe breathing difficulty, cannot swallow their saliva, becomes unusually drowsy or unresponsive, or develops rapidly worsening blistering while appearing seriously unwell.<\/p>\n\n\n\n
What Happens During a Specialist Dermatology Assessment?<\/strong><\/h2>\n\n\n\nDuring the appointment, the dermatologist will ask about your child’s blisters, including when they started, how they have changed, and whether they cause itching, pain, or burning. You should also mention any mouth, eye, or genital symptoms, recent infections, medicines, and previous treatments.<\/p>\n\n\n\n
The dermatologist will examine your child’s skin and may ask to see photographs taken when fresh blisters were present. Clear photographs can provide useful information about how the rash developed, but photographs alone cannot confirm the diagnosis because several blistering conditions can look similar.<\/p>\n\n\n\n
Clinical Tip<\/strong><\/p>\n\n\n\nTake clear photographs when new blisters appear, including one close-up image and one showing where the rash is located. Keep a brief record of recent infections, new medicines and when each flare began, but do not stop a prescribed medicine unless the dermatologist or prescribing clinician advises you to do so.<\/p>\n\n\n\n
How Is Linear IgA Disease Diagnosed?<\/strong><\/h2>\n\n\n\nLinear IgA disease usually needs a skin biopsy because several childhood blistering conditions can look similar. The dermatologist will normally select skin close to a fresh blister for direct immunofluorescence and may take another sample from the blistered area for routine microscopic examination.<\/p>\n\n\n\n
The direct immunofluorescence test looks for a linear pattern of IgA along the basement membrane zone. If the result is negative or unclear but clinical suspicion remains high, the dermatologist may review the biopsy site, repeat the test or arrange additional specialist investigations.<\/p>\n\n\n\n
Evidence Note<\/strong><\/p>\n\n\n\nDirect immunofluorescence is considered the key test for linear IgA disease because it can demonstrate the characteristic linear IgA deposits along the basement membrane zone. The sample is normally taken from skin beside a fresh blister rather than from the centre of an old or eroded lesion, as damaged skin may be less suitable for accurate testing; when suspicion remains high despite an unclear result, repeat biopsy or further specialist tests may be considered (Shin et al., 2021).<\/p>\n\n\n\n
Will My Child Need Other Tests?<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\nYour child may need blood tests to support the assessment or check their overall health, but these tests alone cannot confirm linear IgA disease. The dermatologist will decide which investigations are needed based on your child’s symptoms rather than ordering every possible test.<\/p>\n\n\n\n
You should tell the dermatologist if your child has symptoms such as ongoing diarrhoea, abdominal pain, poor growth, or unexplained weight loss, as these may require further assessment. The results of all the tests will help your child’s specialist make an accurate diagnosis and plan the most appropriate treatment.<\/p>\n\n\n\n
How Is Linear IgA Disease Treated?<\/strong><\/h2>\n\n\n\nTreatment is tailored to the extent of your child’s blistering, itching and mucosal involvement. A topical corticosteroid may be sufficient for limited skin disease, while more extensive or persistent disease commonly requires an oral medicine. Dapsone is frequently used because it can reduce new blister formation, but it is not suitable for every child.<\/p>\n\n\n\n
If dapsone cannot be used, does not adequately control the disease or causes unacceptable side effects, the specialist may consider another treatment, such as an alternative sulphonamide, an oral corticosteroid, an antibiotic with anti-inflammatory effects or another immune-modifying medicine. Treatment is selected individually because controlled paediatric evidence remains limited and the possible benefits must be balanced against side effects and monitoring requirements.<\/p>\n\n\n\n
What Should You Know About Dapsone Monitoring?<\/strong><\/h2>\n\n\n\nBefore starting dapsone, the specialist will usually arrange blood tests, including a full blood count, liver and kidney function tests and a test for glucose-6-phosphate dehydrogenase deficiency. Further blood tests are required after treatment begins because dapsone can affect blood cells and, less commonly, the liver or other organs. The exact schedule should follow the paediatric dermatology team’s protocol.<\/p>\n\n\n\n
Seek urgent medical advice if your child develops a fever, sore throat, mouth ulcers, unusual bruising or bleeding, marked tiredness, breathlessness, blue or grey lips, yellowing of the skin or eyes, dark urine, swollen glands or a widespread new rash. Follow the emergency instructions provided by the prescribing team.<\/p>\n\n\n\n
The British Association of Dermatologists advises stopping dapsone immediately if an allergic reaction is suspected and seeking advice from the GP or dermatologist as soon as possible. For other concerning symptoms, contact the prescribing team urgently and follow its instructions. Do not restart dapsone or alter the dose unless a qualified clinician advises you to do so.<\/p>\n\n\n\n
UK Guidance Note: Dapsone Safety<\/strong><\/p>\n\n\n\nBritish dermatology guidance advises checking the full blood count, liver function and kidney function before dapsone treatment, together with assessment for G6PD deficiency. Frequent blood tests are required after treatment begins, with the schedule adjusted according to your child’s results, dose and specialist paediatric protocol. You should also receive clear written advice about warning symptoms, when to stop treatment and whom to contact if your child becomes unwell.<\/p>\n\n\n\n
How Can You Care for Your Child\u2019s Skin?<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\nFollow the dermatology team’s instructions for cleaning, dressing and protecting open or crusted areas. Loose clothing, short fingernails and suitable non-perfumed skin products may reduce friction and scratching. Do not burst intact blisters or apply antiseptics, antibiotics, corticosteroids or alternative remedies unless the clinical team recommends them.<\/p>\n\n\n\n
Ask the team for advice about bathing, swimming, school attendance and dressings, particularly when blisters are widespread or affect the groin. Seek medical advice if the skin becomes increasingly red, warm, swollen or painful, produces discharge or is accompanied by fever.<\/p>\n\n\n\n
Myth vs Fact<\/strong><\/h2>\n\n\n\n
<\/figure>\n\n\n\nLinear IgA disease can also affect your child’s mouth, eyes, or genital area, not just the skin. You may notice painful blisters or ulcers that make eating, drinking, brushing teeth, or passing urine uncomfortable.<\/p>\n\n\n\n
If your child develops red, painful, or watery eyes, becomes sensitive to light, or has any changes in their vision, you should seek medical advice promptly. Early treatment can help prevent complications and protect your child’s eyes and other affected areas.<\/p>\n\n\n\n
What Causes Linear IgA Disease?<\/strong><\/h2>\n\n\n\nIn most children, doctors cannot identify a single cause of linear IgA disease, so you may not find a clear reason why your child developed the condition. It occurs when the immune system mistakenly attacks healthy skin, leading to blister formation.<\/p>\n\n\n\n
In some cases, infections or certain medicines may act as a trigger, although this is less common in children. You should tell your dermatologist about any medicines your child has recently taken, but you should never stop a prescribed medicine without medical advice.<\/p>\n\n\n\n
Is Linear IgA Disease Contagious or Inherited?<\/strong><\/h2>\n\n\n\nLinear IgA disease is not contagious, so your child cannot pass it to other children through close contact, sharing items, or attending school. You can continue normal family interactions without worrying about spreading the condition.<\/p>\n\n\n\n
The condition is also not usually inherited, and having one child with linear IgA disease does not mean another child will develop it. You should not blame yourself, as the condition is not caused by your child’s diet, hygiene, clothing, or the way you care for them.<\/p>\n\n\n\n
When Should You Seek Medical Advice?<\/strong><\/h2>\n\n\n\nArrange a medical assessment if your child develops unexplained, recurring or widespread blisters, particularly when new lesions continue to appear, the skin becomes increasingly painful or there are signs of infection such as spreading redness, warmth, swelling, discharge or fever.<\/p>\n\n\n\n
Request urgent same-day medical advice if your child develops eye redness, eye pain, light sensitivity or visual changes, or if painful mouth or genital lesions interfere with eating, drinking or passing urine. Call 999 if your child has severe breathing difficulty, cannot swallow their saliva, becomes unusually drowsy or unresponsive, or develops rapidly worsening blistering while appearing seriously unwell.<\/p>\n\n\n\n
What Happens During a Specialist Dermatology Assessment?<\/strong><\/h2>\n\n\n\nDuring the appointment, the dermatologist will ask about your child’s blisters, including when they started, how they have changed, and whether they cause itching, pain, or burning. You should also mention any mouth, eye, or genital symptoms, recent infections, medicines, and previous treatments.<\/p>\n\n\n\n
The dermatologist will examine your child’s skin and may ask to see photographs taken when fresh blisters were present. Clear photographs can provide useful information about how the rash developed, but photographs alone cannot confirm the diagnosis because several blistering conditions can look similar.<\/p>\n\n\n\n
Clinical Tip<\/strong><\/p>\n\n\n\nTake clear photographs when new blisters appear, including one close-up image and one showing where the rash is located. Keep a brief record of recent infections, new medicines and when each flare began, but do not stop a prescribed medicine unless the dermatologist or prescribing clinician advises you to do so.<\/p>\n\n\n\n
How Is Linear IgA Disease Diagnosed?<\/strong><\/h2>\n\n\n\nLinear IgA disease usually needs a skin biopsy because several childhood blistering conditions can look similar. The dermatologist will normally select skin close to a fresh blister for direct immunofluorescence and may take another sample from the blistered area for routine microscopic examination.<\/p>\n\n\n\n
The direct immunofluorescence test looks for a linear pattern of IgA along the basement membrane zone. If the result is negative or unclear but clinical suspicion remains high, the dermatologist may review the biopsy site, repeat the test or arrange additional specialist investigations.<\/p>\n\n\n\n
Evidence Note<\/strong><\/p>\n\n\n\nDirect immunofluorescence is considered the key test for linear IgA disease because it can demonstrate the characteristic linear IgA deposits along the basement membrane zone. The sample is normally taken from skin beside a fresh blister rather than from the centre of an old or eroded lesion, as damaged skin may be less suitable for accurate testing; when suspicion remains high despite an unclear result, repeat biopsy or further specialist tests may be considered (Shin et al., 2021).<\/p>\n\n\n\n
Will My Child Need Other Tests?<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\nYour child may need blood tests to support the assessment or check their overall health, but these tests alone cannot confirm linear IgA disease. The dermatologist will decide which investigations are needed based on your child’s symptoms rather than ordering every possible test.<\/p>\n\n\n\n
You should tell the dermatologist if your child has symptoms such as ongoing diarrhoea, abdominal pain, poor growth, or unexplained weight loss, as these may require further assessment. The results of all the tests will help your child’s specialist make an accurate diagnosis and plan the most appropriate treatment.<\/p>\n\n\n\n
How Is Linear IgA Disease Treated?<\/strong><\/h2>\n\n\n\nTreatment is tailored to the extent of your child’s blistering, itching and mucosal involvement. A topical corticosteroid may be sufficient for limited skin disease, while more extensive or persistent disease commonly requires an oral medicine. Dapsone is frequently used because it can reduce new blister formation, but it is not suitable for every child.<\/p>\n\n\n\n
If dapsone cannot be used, does not adequately control the disease or causes unacceptable side effects, the specialist may consider another treatment, such as an alternative sulphonamide, an oral corticosteroid, an antibiotic with anti-inflammatory effects or another immune-modifying medicine. Treatment is selected individually because controlled paediatric evidence remains limited and the possible benefits must be balanced against side effects and monitoring requirements.<\/p>\n\n\n\n
What Should You Know About Dapsone Monitoring?<\/strong><\/h2>\n\n\n\nBefore starting dapsone, the specialist will usually arrange blood tests, including a full blood count, liver and kidney function tests and a test for glucose-6-phosphate dehydrogenase deficiency. Further blood tests are required after treatment begins because dapsone can affect blood cells and, less commonly, the liver or other organs. The exact schedule should follow the paediatric dermatology team’s protocol.<\/p>\n\n\n\n
Seek urgent medical advice if your child develops a fever, sore throat, mouth ulcers, unusual bruising or bleeding, marked tiredness, breathlessness, blue or grey lips, yellowing of the skin or eyes, dark urine, swollen glands or a widespread new rash. Follow the emergency instructions provided by the prescribing team.<\/p>\n\n\n\n
The British Association of Dermatologists advises stopping dapsone immediately if an allergic reaction is suspected and seeking advice from the GP or dermatologist as soon as possible. For other concerning symptoms, contact the prescribing team urgently and follow its instructions. Do not restart dapsone or alter the dose unless a qualified clinician advises you to do so.<\/p>\n\n\n\n
UK Guidance Note: Dapsone Safety<\/strong><\/p>\n\n\n\nBritish dermatology guidance advises checking the full blood count, liver function and kidney function before dapsone treatment, together with assessment for G6PD deficiency. Frequent blood tests are required after treatment begins, with the schedule adjusted according to your child’s results, dose and specialist paediatric protocol. You should also receive clear written advice about warning symptoms, when to stop treatment and whom to contact if your child becomes unwell.<\/p>\n\n\n\n
How Can You Care for Your Child\u2019s Skin?<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\nFollow the dermatology team’s instructions for cleaning, dressing and protecting open or crusted areas. Loose clothing, short fingernails and suitable non-perfumed skin products may reduce friction and scratching. Do not burst intact blisters or apply antiseptics, antibiotics, corticosteroids or alternative remedies unless the clinical team recommends them.<\/p>\n\n\n\n
Ask the team for advice about bathing, swimming, school attendance and dressings, particularly when blisters are widespread or affect the groin. Seek medical advice if the skin becomes increasingly red, warm, swollen or painful, produces discharge or is accompanied by fever.<\/p>\n\n\n\n
Myth vs Fact<\/strong><\/h2>\n\n\n\n
Linear IgA disease is not contagious, so your child cannot pass it to other children through close contact, sharing items, or attending school. You can continue normal family interactions without worrying about spreading the condition.<\/p>\n\n\n\n
The condition is also not usually inherited, and having one child with linear IgA disease does not mean another child will develop it. You should not blame yourself, as the condition is not caused by your child’s diet, hygiene, clothing, or the way you care for them.<\/p>\n\n\n\n
When Should You Seek Medical Advice?<\/strong><\/h2>\n\n\n\nArrange a medical assessment if your child develops unexplained, recurring or widespread blisters, particularly when new lesions continue to appear, the skin becomes increasingly painful or there are signs of infection such as spreading redness, warmth, swelling, discharge or fever.<\/p>\n\n\n\n
Request urgent same-day medical advice if your child develops eye redness, eye pain, light sensitivity or visual changes, or if painful mouth or genital lesions interfere with eating, drinking or passing urine. Call 999 if your child has severe breathing difficulty, cannot swallow their saliva, becomes unusually drowsy or unresponsive, or develops rapidly worsening blistering while appearing seriously unwell.<\/p>\n\n\n\n
What Happens During a Specialist Dermatology Assessment?<\/strong><\/h2>\n\n\n\nDuring the appointment, the dermatologist will ask about your child’s blisters, including when they started, how they have changed, and whether they cause itching, pain, or burning. You should also mention any mouth, eye, or genital symptoms, recent infections, medicines, and previous treatments.<\/p>\n\n\n\n
The dermatologist will examine your child’s skin and may ask to see photographs taken when fresh blisters were present. Clear photographs can provide useful information about how the rash developed, but photographs alone cannot confirm the diagnosis because several blistering conditions can look similar.<\/p>\n\n\n\n
Clinical Tip<\/strong><\/p>\n\n\n\nTake clear photographs when new blisters appear, including one close-up image and one showing where the rash is located. Keep a brief record of recent infections, new medicines and when each flare began, but do not stop a prescribed medicine unless the dermatologist or prescribing clinician advises you to do so.<\/p>\n\n\n\n
How Is Linear IgA Disease Diagnosed?<\/strong><\/h2>\n\n\n\nLinear IgA disease usually needs a skin biopsy because several childhood blistering conditions can look similar. The dermatologist will normally select skin close to a fresh blister for direct immunofluorescence and may take another sample from the blistered area for routine microscopic examination.<\/p>\n\n\n\n
The direct immunofluorescence test looks for a linear pattern of IgA along the basement membrane zone. If the result is negative or unclear but clinical suspicion remains high, the dermatologist may review the biopsy site, repeat the test or arrange additional specialist investigations.<\/p>\n\n\n\n
Evidence Note<\/strong><\/p>\n\n\n\nDirect immunofluorescence is considered the key test for linear IgA disease because it can demonstrate the characteristic linear IgA deposits along the basement membrane zone. The sample is normally taken from skin beside a fresh blister rather than from the centre of an old or eroded lesion, as damaged skin may be less suitable for accurate testing; when suspicion remains high despite an unclear result, repeat biopsy or further specialist tests may be considered (Shin et al., 2021).<\/p>\n\n\n\n
Will My Child Need Other Tests?<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\nYour child may need blood tests to support the assessment or check their overall health, but these tests alone cannot confirm linear IgA disease. The dermatologist will decide which investigations are needed based on your child’s symptoms rather than ordering every possible test.<\/p>\n\n\n\n
You should tell the dermatologist if your child has symptoms such as ongoing diarrhoea, abdominal pain, poor growth, or unexplained weight loss, as these may require further assessment. The results of all the tests will help your child’s specialist make an accurate diagnosis and plan the most appropriate treatment.<\/p>\n\n\n\n
How Is Linear IgA Disease Treated?<\/strong><\/h2>\n\n\n\nTreatment is tailored to the extent of your child’s blistering, itching and mucosal involvement. A topical corticosteroid may be sufficient for limited skin disease, while more extensive or persistent disease commonly requires an oral medicine. Dapsone is frequently used because it can reduce new blister formation, but it is not suitable for every child.<\/p>\n\n\n\n
If dapsone cannot be used, does not adequately control the disease or causes unacceptable side effects, the specialist may consider another treatment, such as an alternative sulphonamide, an oral corticosteroid, an antibiotic with anti-inflammatory effects or another immune-modifying medicine. Treatment is selected individually because controlled paediatric evidence remains limited and the possible benefits must be balanced against side effects and monitoring requirements.<\/p>\n\n\n\n
What Should You Know About Dapsone Monitoring?<\/strong><\/h2>\n\n\n\nBefore starting dapsone, the specialist will usually arrange blood tests, including a full blood count, liver and kidney function tests and a test for glucose-6-phosphate dehydrogenase deficiency. Further blood tests are required after treatment begins because dapsone can affect blood cells and, less commonly, the liver or other organs. The exact schedule should follow the paediatric dermatology team’s protocol.<\/p>\n\n\n\n
Seek urgent medical advice if your child develops a fever, sore throat, mouth ulcers, unusual bruising or bleeding, marked tiredness, breathlessness, blue or grey lips, yellowing of the skin or eyes, dark urine, swollen glands or a widespread new rash. Follow the emergency instructions provided by the prescribing team.<\/p>\n\n\n\n
The British Association of Dermatologists advises stopping dapsone immediately if an allergic reaction is suspected and seeking advice from the GP or dermatologist as soon as possible. For other concerning symptoms, contact the prescribing team urgently and follow its instructions. Do not restart dapsone or alter the dose unless a qualified clinician advises you to do so.<\/p>\n\n\n\n
UK Guidance Note: Dapsone Safety<\/strong><\/p>\n\n\n\nBritish dermatology guidance advises checking the full blood count, liver function and kidney function before dapsone treatment, together with assessment for G6PD deficiency. Frequent blood tests are required after treatment begins, with the schedule adjusted according to your child’s results, dose and specialist paediatric protocol. You should also receive clear written advice about warning symptoms, when to stop treatment and whom to contact if your child becomes unwell.<\/p>\n\n\n\n
How Can You Care for Your Child\u2019s Skin?<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\nFollow the dermatology team’s instructions for cleaning, dressing and protecting open or crusted areas. Loose clothing, short fingernails and suitable non-perfumed skin products may reduce friction and scratching. Do not burst intact blisters or apply antiseptics, antibiotics, corticosteroids or alternative remedies unless the clinical team recommends them.<\/p>\n\n\n\n
Ask the team for advice about bathing, swimming, school attendance and dressings, particularly when blisters are widespread or affect the groin. Seek medical advice if the skin becomes increasingly red, warm, swollen or painful, produces discharge or is accompanied by fever.<\/p>\n\n\n\n
Myth vs Fact<\/strong><\/h2>\n\n\n\n
During the appointment, the dermatologist will ask about your child’s blisters, including when they started, how they have changed, and whether they cause itching, pain, or burning. You should also mention any mouth, eye, or genital symptoms, recent infections, medicines, and previous treatments.<\/p>\n\n\n\n
The dermatologist will examine your child’s skin and may ask to see photographs taken when fresh blisters were present. Clear photographs can provide useful information about how the rash developed, but photographs alone cannot confirm the diagnosis because several blistering conditions can look similar.<\/p>\n\n\n\n
Clinical Tip<\/strong><\/p>\n\n\n\n Take clear photographs when new blisters appear, including one close-up image and one showing where the rash is located. Keep a brief record of recent infections, new medicines and when each flare began, but do not stop a prescribed medicine unless the dermatologist or prescribing clinician advises you to do so.<\/p>\n\n\n\n Linear IgA disease usually needs a skin biopsy because several childhood blistering conditions can look similar. The dermatologist will normally select skin close to a fresh blister for direct immunofluorescence and may take another sample from the blistered area for routine microscopic examination.<\/p>\n\n\n\n The direct immunofluorescence test looks for a linear pattern of IgA along the basement membrane zone. If the result is negative or unclear but clinical suspicion remains high, the dermatologist may review the biopsy site, repeat the test or arrange additional specialist investigations.<\/p>\n\n\n\n Evidence Note<\/strong><\/p>\n\n\n\n Direct immunofluorescence is considered the key test for linear IgA disease because it can demonstrate the characteristic linear IgA deposits along the basement membrane zone. The sample is normally taken from skin beside a fresh blister rather than from the centre of an old or eroded lesion, as damaged skin may be less suitable for accurate testing; when suspicion remains high despite an unclear result, repeat biopsy or further specialist tests may be considered (Shin et al., 2021).<\/p>\n\n\n\n Your child may need blood tests to support the assessment or check their overall health, but these tests alone cannot confirm linear IgA disease. The dermatologist will decide which investigations are needed based on your child’s symptoms rather than ordering every possible test.<\/p>\n\n\n\n You should tell the dermatologist if your child has symptoms such as ongoing diarrhoea, abdominal pain, poor growth, or unexplained weight loss, as these may require further assessment. The results of all the tests will help your child’s specialist make an accurate diagnosis and plan the most appropriate treatment.<\/p>\n\n\n\n Treatment is tailored to the extent of your child’s blistering, itching and mucosal involvement. A topical corticosteroid may be sufficient for limited skin disease, while more extensive or persistent disease commonly requires an oral medicine. Dapsone is frequently used because it can reduce new blister formation, but it is not suitable for every child.<\/p>\n\n\n\n If dapsone cannot be used, does not adequately control the disease or causes unacceptable side effects, the specialist may consider another treatment, such as an alternative sulphonamide, an oral corticosteroid, an antibiotic with anti-inflammatory effects or another immune-modifying medicine. Treatment is selected individually because controlled paediatric evidence remains limited and the possible benefits must be balanced against side effects and monitoring requirements.<\/p>\n\n\n\n Before starting dapsone, the specialist will usually arrange blood tests, including a full blood count, liver and kidney function tests and a test for glucose-6-phosphate dehydrogenase deficiency. Further blood tests are required after treatment begins because dapsone can affect blood cells and, less commonly, the liver or other organs. The exact schedule should follow the paediatric dermatology team’s protocol.<\/p>\n\n\n\n Seek urgent medical advice if your child develops a fever, sore throat, mouth ulcers, unusual bruising or bleeding, marked tiredness, breathlessness, blue or grey lips, yellowing of the skin or eyes, dark urine, swollen glands or a widespread new rash. Follow the emergency instructions provided by the prescribing team.<\/p>\n\n\n\n The British Association of Dermatologists advises stopping dapsone immediately if an allergic reaction is suspected and seeking advice from the GP or dermatologist as soon as possible. For other concerning symptoms, contact the prescribing team urgently and follow its instructions. Do not restart dapsone or alter the dose unless a qualified clinician advises you to do so.<\/p>\n\n\n\n UK Guidance Note: Dapsone Safety<\/strong><\/p>\n\n\n\n British dermatology guidance advises checking the full blood count, liver function and kidney function before dapsone treatment, together with assessment for G6PD deficiency. Frequent blood tests are required after treatment begins, with the schedule adjusted according to your child’s results, dose and specialist paediatric protocol. You should also receive clear written advice about warning symptoms, when to stop treatment and whom to contact if your child becomes unwell.<\/p>\n\n\n\n Follow the dermatology team’s instructions for cleaning, dressing and protecting open or crusted areas. Loose clothing, short fingernails and suitable non-perfumed skin products may reduce friction and scratching. Do not burst intact blisters or apply antiseptics, antibiotics, corticosteroids or alternative remedies unless the clinical team recommends them.<\/p>\n\n\n\n Ask the team for advice about bathing, swimming, school attendance and dressings, particularly when blisters are widespread or affect the groin. Seek medical advice if the skin becomes increasingly red, warm, swollen or painful, produces discharge or is accompanied by fever.<\/p>\n\n\n\nHow Is Linear IgA Disease Diagnosed?<\/strong><\/h2>\n\n\n\n
Will My Child Need Other Tests?<\/strong><\/h2>\n\n\n\n
<\/figure>\n\n\n\nHow Is Linear IgA Disease Treated?<\/strong><\/h2>\n\n\n\n
What Should You Know About Dapsone Monitoring?<\/strong><\/h2>\n\n\n\n
How Can You Care for Your Child\u2019s Skin?<\/strong><\/h2>\n\n\n\n
<\/figure>\n\n\n\nMyth vs Fact<\/strong><\/h2>\n\n\n\n