“Intraepidermal” means that the cancerous cells are located in the epidermis from where they originally developed (in situ). Squamous cell carcinoma in situ (SCCIS) is a vitiated, superficial growth of cancerous cells on the skin’s outer layer. It is not a severe condition but could develop into a full form of invasive skin cancer if not detected early or well managed. It is also known as carcinoma in situ in the literature or as Bowen disease after John T. Bowen, an American dermatologist who first described the condition in 1912. Flat cells, known as squamous cells, are located in the epidermis. They are responsible for the production of the keratin protein and affected by this condition.
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