DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Bowenoid keratosis. Close-up of a bowenoid keratosis behind the ear of an 88-year-old male patient. Bowenoid keratosis is a pre-cancerous lesion, one step on from a harmless solar keratosis caused by overexposure to sunlight, on the way to squamous cell carcinoma (skin cancer).
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