{"id":7021,"date":"2026-08-10T11:25:35","date_gmt":"2026-08-10T11:25:35","guid":{"rendered":"https:\/\/www.london-dermatology-centre.co.uk\/blog\/?p=7021"},"modified":"2026-08-10T11:25:37","modified_gmt":"2026-08-10T11:25:37","slug":"history-of-mohs-surgery","status":"publish","type":"post","link":"https:\/\/www.london-dermatology-centre.co.uk\/blog\/history-of-mohs-surgery\/","title":{"rendered":"The History of Mohs Surgery: How It Became the Gold Standard for Skin Cancer"},"content":{"rendered":"\n

Mohs surgery may sound like a modern treatment, but its origins date back to the 1930s. The technique has changed considerably since its earliest form, but the principle remains recognisable: your cancer is removed in carefully mapped stages so that remaining tumour can be identified microscopically while as much healthy tissue as possible is preserved.<\/p>\n\n\n\n

Understanding this history can help you see why Mohs surgery now has an important role in selected high-risk, recurrent or anatomically sensitive skin cancers. It is not the best treatment for every skin cancer, and your dermatologist should recommend it according to your tumour type, location, previous treatment and other risk factors.<\/p>\n\n\n\n

What Is Mohs Surgery?<\/strong><\/h2>\n\n\n\n

Mohs micrographic surgery is a specialised technique used to remove selected skin cancers in carefully mapped stages. Your surgeon removes the visible tumour and a thin layer of surrounding and underlying tissue, which is processed so that the peripheral and deep margins can be examined under a microscope.<\/p>\n\n\n\n

If cancer remains at part of your surgical margin, your map allows your surgeon to return to that specific location and remove another stage. Your treatment continues until the examined margins are clear, helping preserve healthy tissue that does not need to be removed.<\/p>\n\n\n\n

Who Was Frederic Mohs?<\/strong><\/h2>\n\n\n\n

The procedure takes its name from Dr Frederic E. Mohs, an American doctor born in 1910 who developed the foundations of the technique while studying and working at the University of Wisconsin. His early work focused on examining cancerous tissue under a microscope and finding a more precise and controlled way to remove it.<\/p>\n\n\n\n

Through his research, Dr Mohs developed the principles that would later form the basis of Mohs surgery. His approach aimed to help surgeons identify cancer cells accurately while limiting the removal of surrounding healthy tissue.<\/p>\n\n\n\n

How the Idea Began<\/strong><\/h2>\n\n\n\n

Between 1929 and 1934, Frederic Mohs studied at the University of Wisconsin and worked as a research assistant with cancer researcher Michael Guyer. His work with tissue preparation and experimental tumours helped develop the ideas that would eventually lead to microscopically controlled cancer surgery.<\/p>\n\n\n\n

For you as a modern patient, the important innovation was the combination of tissue removal, microscopic examination and precise mapping. This allowed additional tissue to be taken specifically from areas where tumour remained rather than automatically enlarging the entire surgical wound.<\/p>\n\n\n\n

The First Mohs Patient<\/strong><\/h2>\n\n\n\n

A major milestone came on 30 June 1936, when Frederic Mohs treated his first clinical patient using his developing technique for a squamous cell carcinoma of the lower lip. If you look back at the development of modern Mohs surgery, this case represents the beginning of the clinical use of microscopically controlled, mapped tumour removal.<\/p>\n\n\n\n

Mohs continued refining his technique during the following years. By 1940, his clinical practice had expanded, helping establish microscopically controlled surgery as a developing method of treating selected skin cancers.<\/p>\n\n\n\n

The Early Chemosurgery Technique<\/strong><\/h2>\n\n\n\n

The original method was called chemosurgery because zinc chloride paste was applied to fix your tissue in place before it was surgically removed. The process preserved microscopic tissue structure so that Mohs could examine the removed layer and map where tumour remained.<\/p>\n\n\n\n

If you had undergone this early form of treatment, the procedure would have been very different from modern Mohs surgery. Zinc chloride could cause considerable discomfort, and completing treatment could take several days before the wound was ready to heal.<\/p>\n\n\n\n

Why Mapping Was So Important<\/strong><\/h2>\n\n\n\n
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One of Mohs’ most important ideas was to create detailed maps showing exactly where each piece of removed tissue had come from. This allowed the surgeon to connect the microscopic findings with the precise location on the patient’s skin, making the cancer removal process more controlled.<\/p>\n\n\n\n

If cancer cells were found at a particular margin under the microscope, the map showed the surgeon exactly where that tissue had been taken from. Instead of removing more tissue from the entire surgical area, the surgeon could return directly to the affected location and remove another precise layer.<\/p>\n\n\n\n

The Limitations of the Original Method<\/strong><\/h2>\n\n\n\n

The original fixed-tissue Mohs technique provided detailed microscopic control but was slow and uncomfortable because your tissue had to be chemically fixed before removal. Zinc chloride also affected the wound margins, making immediate reconstruction more difficult.<\/p>\n\n\n\n