CID - ISM / SCIENCE PHOTO LIBRARY CID - ISM / SCIENCE PHOTO LIBRARY
Pyoderma gangrenosum. Close-up of ulcers on the leg of a 38-year-old male patient with pyoderma gangrenosum. This condition causes the cells in skin tissue to die (necrosis) leading to deep ulcers. The disease is thought to be due to immune system dysfunction, in particular improper functioning of neutrophil white blood cells.
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