DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Cutaneous horn on a 92 year old man's chest. These horns result from an overgrowth of the skin protein keratin. They are slow-growing and may vary in colour from yellow to black independent of skin colour. They may develop where there was previously a wart on the skin. Treatment is with surgical removal.
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