If you are having radiotherapy for prostate cancer, you may notice skin changes during treatment. The reaction can vary, and your skin may become red or darker, dry, itchy or sore in areas included in the treatment field.
Tell your radiotherapy team if you notice new skin changes or increasing soreness. Your team can suggest suitable skin care to help you stay comfortable while the area recovers.
Why Can Radiotherapy Affect Your Skin?
External beam radiotherapy can affect your skin because the beams pass through tissues within the treatment field. You may notice dryness, itching, colour changes or soreness as your treatment continues, although some people have little or no visible reaction.
More noticeable reactions, such as peeling or broken skin, can sometimes occur but are not inevitable. You and your radiotherapy team can monitor the area throughout treatment and adjust your skin care if needed.
Does Everyone Having Prostate Radiotherapy Develop a Skin Reaction?
No, your experience may be very different from someone else having prostate radiotherapy. Your skin reaction can depend on your treatment plan, radiation dose, number of sessions and the tissues exposed, while modern techniques are designed to limit unnecessary radiation.
You may notice mild redness, soreness or darkening, although you may not develop every possible side effect. You should judge your skin by changes from its usual appearance, as radiation reactions may look redder on lighter skin or darker, grey or purple on brown or black skin.
When Do Radiation Skin Reactions Usually Begin?
Skin changes usually develop gradually rather than after your first radiotherapy session. You may notice sensitivity or colour changes after a week or two, and your skin may later become dry, itchy or sore.
Your skin can remain sensitive or briefly worsen after your final session. You and your radiotherapy team can monitor recovery, which often improves over the following few weeks.
Evidence Note
Acute radiation skin reactions usually build gradually rather than appearing immediately after the first treatment. They can continue to worsen briefly after the final session before recovery begins, so skin care and reporting symptoms remain important even after the course has finished.
What Can a Mild Radiation Skin Reaction Look Like?
A mild reaction may cause subtle redness or darkening, and your skin may feel warmer or more sensitive. You may also notice dryness, flaking, itching or tightness as your treatment continues.
Tell your radiotherapy team about these changes during appointments. You and your treatment team can then adjust skin care before the area becomes more uncomfortable.
Can Prostate Radiotherapy Cause Itching?
You may notice itching as your skin becomes dry or irritated during prostate radiotherapy. You should try not to scratch, as repeated scratching can damage your skin and make irritation worse.
You should tell your radiotherapy team if the itching becomes troublesome. You and your treatment team can choose a suitable moisturiser or other care, especially if the itching spreads beyond the treatment area.
Can the Skin Become Sore or Painful?
Your skin may become tender or sore as prostate radiotherapy continues. You might notice this more around your groin, perineum, anus or scrotum, especially when clothing rubs or when you walk, sit or wash.
Tell your radiotherapy team if soreness becomes significant rather than simply tolerating it. You and your treatment team can discuss creams, dressings or pain relief to protect the area and improve your comfort.
Clinical Tip
If walking, sitting, underwear or skin-to-skin friction is making the treated area more painful, tell your radiotherapy team early. They may be able to suggest changes to clothing, skin care, dressings or pain relief before the reaction becomes more difficult to manage.
Can Radiation Cause Peeling or Broken Skin?
You may notice peeling if your skin reaction becomes more pronounced during prostate radiotherapy. You could have dry, flaky skin or, with a stronger reaction, moist areas where the surface has broken down.
Tell your radiotherapy team if the skin becomes broken or very sore. You and your treatment team can choose suitable dressings and skin care, and you should avoid ordinary adhesive dressings unless advised otherwise.
Expected Skin Changes vs Changes That Need Prompt Advice
| Skin change | What to do |
| Mild dryness or tightness | Continue gentle skin care and mention it during review |
| Mild colour change | Monitor and follow your treatment team’s advice |
| Mild itching | Avoid scratching and ask about suitable moisturiser if troublesome |
| Increasing pain or marked soreness | Contact the radiotherapy team |
| Moist, weeping or broken skin | Contact the team promptly for assessment and dressings |
| Blistering or bleeding | Seek prompt advice |
| Increasing swelling, warmth or discharge | Needs assessment for possible infection |
| Widespread rash outside the treatment field | Tell the clinical team because another cause may need consideration |
| Fever or feeling generally unwell with worsening skin | Seek prompt medical assessment |
How Should You Wash the Treated Area?
Wash the treated area gently with warm or cool water and your usual mild soap or shower product if it does not irritate your skin. You can use your hands, avoid scrubbing and pat the area dry with a soft towel.
You should avoid very hot water, rough flannels and exfoliating products because they can increase irritation. You should follow your radiotherapy team’s specific advice, especially around treatment markings, and ask before trying to remove them yourself.
UK Guidance Note
UK radiotherapy skin-care guidance supports gentle daily washing rather than avoiding water. You can usually continue using familiar washing products if they do not irritate the treated skin, but avoid rubbing or scrubbing and follow any specific instructions from your radiotherapy department.
Should You Use Moisturiser During Prostate Radiotherapy?
You can use a simple, unperfumed moisturiser if your skin becomes dry or tight during radiotherapy. Follow your radiotherapy team’s advice about which product to use and when you should apply it around treatment.
Avoid heavily fragranced or active skincare products if your skin feels sensitive. If a moisturiser stings or increases irritation, stop using it and ask your radiotherapy team whether another product would suit you better.
Research Insight
Research into radiation dermatitis includes many creams, dressings and preventative products, but evidence is uneven. A major systematic review identified 235 studies, including 149 randomised trials, yet evidence for many individual interventions remained insufficient or inconsistent. This is why product choice should be guided by your radiotherapy team rather than assuming that one over-the-counter cream is best for everyone.
What Products Should You Avoid on the Treated Skin?
You should keep your skincare routine simple during prostate radiotherapy because some products can make sensitive skin more irritated. Check with your radiotherapy team before using anything new on the treated area.
- Fragranced products: Perfume and heavily scented skincare may irritate sensitive skin.
- Strong active ingredients: Acids, retinoids and exfoliants are best avoided unless your team advises otherwise.
- Talcum powder: You may be advised not to use powder on the treated area.
- Adhesive products: Avoid sticking dressings or tapes directly to irritated skin unless recommended.
You should also check before shaving within the treatment area, as an electric trimmer may sometimes be more suitable. Your treatment team can advise you about any product you are unsure about.
What Should You Know About Heat, Sun and Swimming?
You should protect your treated skin from heat, ice and direct sunlight during and after radiotherapy. You may also need high-factor sun protection after treatment, especially if the treated area is exposed.
Ask your radiotherapy team before swimming, particularly if the skin is sore or broken. You and your treatment team can decide when swimming and other activities are safe.
What Clothing Is Most Comfortable During Treatment?
You may find that loose, soft clothing feels more comfortable when your skin becomes sensitive during prostate radiotherapy. You should avoid tight underwear or trousers that rub against your groin or buttocks, and choose breathable fabrics where possible.
Change out of damp clothing if it is increasing moisture or friction. You do not need to replace your wardrobe, but you and your treatment team can consider whether a different underwear style would help.
Can Hair Fall Out in the Treatment Area?
You may notice some pubic hair loss during prostate radiotherapy if the treatment field includes hair-bearing skin. You should know that this is usually temporary, and your hair may begin growing back over the following months after treatment.
You should avoid shaving or waxing irritated skin while the hair is shedding. You and your treatment team can monitor the area, and you should mention it if hair loss extends beyond the expected treatment field.
What Happens to Your Skin After Radiotherapy Finishes?
Your skin may not look better immediately after your final radiotherapy session. You may notice redness, darkening or soreness for a little longer, and your reaction can peak before gradually improving over the following few weeks.
Continue gentle skincare while your skin heals and follow the treatment team’s advice. You may notice longer-term changes, such as darker skin or small visible blood vessels, and you should mention any changes that concern you.
When Should You Contact Your Radiotherapy Team About Your Skin?
You should tell your radiotherapy team about skin changes early rather than waiting for them to become severe. You may need advice if your skin becomes increasingly painful, peels extensively, develops moist or broken areas, or starts to blister or bleed.
Report swelling, discharge, increasing warmth or tenderness, or feeling generally unwell, as these changes may need assessment for infection. You and your treatment team can manage symptoms early, and you should know that reporting side effects does not usually mean radiotherapy will stop.
When Might You Need Dermatology Advice?
Contact your radiotherapy team first if you develop a new reaction within the treatment area. A different assessment may be needed if your rash spreads beyond the treatment field or you already have eczema, psoriasis or a fungal infection.
You and your treatment team can decide whether unusual or persistent changes need specialist advice. Tell any dermatologist about your radiotherapy dates, other cancer treatments and when your skin changes began.
Myth vs Fact
| Myth | Fact |
| Everyone having prostate radiotherapy develops severe skin damage | Reactions vary and some people have little visible skin change |
| You should avoid washing the treated area | Gentle washing is generally encouraged |
| Redness is the only way radiation dermatitis appears | Brown or black skin may become darker, grey, purple or otherwise different from its usual tone |
| Any moisturiser will prevent radiation dermatitis | No single moisturiser is proven to prevent every reaction |
| Broken or weeping skin should be treated with an ordinary adhesive plaster | Moist desquamation needs advice and appropriate non-stick care |
| Skin must improve as soon as radiotherapy ends | Reactions can remain worse briefly before recovery begins |
| Reporting a reaction means radiotherapy will automatically be stopped | Most reactions are managed while treatment continues; interruption is uncommon |
| Every rash after radiotherapy is caused by radiation | Rashes outside the field or unusual persistent changes may have another cause |
Key Takeaways
- Prostate radiotherapy can cause colour change, dryness, itching or soreness, although skin reactions vary and may briefly worsen after treatment ends.
- Gentle washing, suitable moisturiser and avoiding friction or irritating products can help keep treated skin comfortable.
- Broken or weeping skin, blistering, bleeding, worsening pain, swelling, discharge or feeling unwell should be reported promptly.
- Pubic hair loss may occur, while some longer-term changes such as pigmentation changes or visible small blood vessels can persist.
- Most reactions can be managed without stopping radiotherapy, while unusual or persistent changes may need further assessment.
Frequently Asked Questions
1. Why do skin reactions vary between people having prostate radiotherapy?
Your skin reaction can vary depending on your treatment plan, radiation dose, number of sessions and the tissues exposed. You may develop mild redness, soreness or darkening, or you may have little or no visible reaction.
2. When might you notice skin reactions after prostate radiotherapy starts?
Skin changes usually develop gradually rather than immediately after your first session. You may notice colour changes or sensitivity after a week or two, and your skin may later become dry, itchy or sore as treatment continues.
3. What can a mild skin reaction from prostate radiotherapy look like?
You may notice subtle redness or darkening, warmth, dryness, flaking, itching or tightness in the treated area. You should tell your radiotherapy team about these changes so you can receive suitable skin-care advice early.
4. Can prostate radiotherapy make your skin itchy or sore?
Your skin may become itchy as it becomes dry or irritated, while soreness can develop around areas such as your groin, perineum, anus or scrotum. You should tell your treatment team if itching or soreness becomes troublesome so they can recommend suitable care.
5. Can your skin peel or become broken during prostate radiotherapy?
A stronger reaction can cause dry peeling or moist areas where the skin surface has broken down. You should tell your radiotherapy team if your skin becomes very sore or broken so they can recommend suitable dressings and care.
6. How should you wash your skin during prostate radiotherapy?
Wash the treated area gently with warm or cool water and your usual mild soap or shower product if it does not irritate the skin. You can use your hands rather than scrubbing and pat the area dry with a soft towel.
7. Can you use moisturiser on your skin during prostate radiotherapy?
You can use a simple, unperfumed moisturiser if your skin becomes dry or tight. Follow your radiotherapy team’s advice about suitable products, and stop using one if it makes your skin sting or become more irritated.
8. What should you avoid putting on your treated skin?
You may need to avoid perfume, talcum powder, strong acids, retinoids, exfoliants and adhesive products unless your radiotherapy team advises otherwise. You should also check with your treatment team before shaving within the treatment area.
9. What happens to your skin after prostate radiotherapy finishes?
Your skin may remain red, darker or sore for a short time after the final session. You should continue gentle skincare while it heals and tell your treatment team about longer-term changes that concern you.
10. Which skin changes should you report promptly during or after radiotherapy?
You should report increasing pain, extensive peeling, moist or broken skin, blistering or bleeding to your radiotherapy team. You should also tell them about swelling, discharge, increasing warmth or tenderness, or feeling generally unwell, as these symptoms may need assessment.
Final Thoughts: Skin Reactions After Prostate Radiotherapy
Skin reactions during prostate radiotherapy can vary from mild dryness, itching and colour changes to soreness, peeling or broken skin. By using gentle skincare, avoiding unnecessary irritation and telling your radiotherapy team about changes early, you can help protect your skin and manage discomfort as it develops.
If you’re looking for a dermatologist in London, you can contact London Dermatology Centre for specialist assessment.
References:
- Society and College of Radiographers (2020) Radiation Dermatitis Information Sheet for Radiotherapy Healthcare Professionals. Available at: https://www.sor.org/getmedia/53bd52ff-679e-48de-82a0-dc8dae570896/2020_version_4_final_practice_guideline_radiotherapy_skin_care_llv1.pdf
- Behroozian, T. et al. (2023) ‘MASCC clinical practice guidelines for the prevention and management of acute radiation dermatitis: part 1) systematic review’, eClinicalMedicine, 58, article 101886. Available at: https://pubmed.ncbi.nlm.nih.gov/37181415/
- Iacovelli, N.A. et al. (2020) ‘Topical treatment of radiation-induced dermatitis: current issues and potential solutions’, Drugs in Context, 9, article 2020-4-7. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC7295106/
- Burke, G., Faithfull, S. and Probst, H. (2022) ‘Radiation induced skin reactions during and following radiotherapy: a systematic review of interventions’, Radiography, 28(1), pp. 232–239. Available at: https://www.sciencedirect.com/science/article/pii/S1078817421001334
- Wilson, B.N. et al. (2022) ‘Consensus on the clinical management of chronic radiation dermatitis and radiation fibrosis: a Delphi survey’, British Journal of Dermatology, 187(6), pp. 1054–1056. Available at: https://academic.oup.com/bjd/article/187/6/1054/6972536