DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Cutaneous horn. A cutaneous horn seen growing on the face of a 90 year-old woman. Such horns 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 2 cm. Surgical removal is usually performed.
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