DR M.A. ANSARY / SCIENCE PHOTO LIBRARY DR M.A. ANSARY / SCIENCE PHOTO LIBRARY
Cutaneous horn growing on right thigh of a patient. Such horns, also known as warty horns or cornu cutaneum, result from an overgrowth of the skin protein keratin. They are slow-growing and may vary in colour from yellow to black. Horns may develop where there was previously a wart on the skin. If left alone, they may grow to a considerable size and protrude up to two centimetres from the skin's surface. Surgical removal is usually performed. Cutaneous horns mostly occur in people over 60 years of age. They are usually benign, although in around 20 percent of cases cancerous cells are found at the base.
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