DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Foot ulcer (black and yellow) on a 55-year-old woman's foot. The black area is dead tissue. Photographed 1 month after the patient's foot was trodden on by a horse, leading to the ulcer seen here. An ulcer is a deep sore where tissue has eroded away.
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