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Merck Manual

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Squamous Cell Carcinoma (Lip)
Squamous Cell Carcinoma (Lip)
Squamous Cell Carcinoma (Lip)

This squamous cell carcinoma on the lip shows excess build up of keratin (a protein that forms on the surface of the skin, appearing as a brown crust) that has broken down to form an open sore. (The doctor has marked the border of the carcinoma with a pen.)

Photo courtesy of Gregory L. Wells, MD.

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Squamous Cell Carcinoma