DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Chilblain on thigh. Close-up of a chilblain on the outer thigh of a 49-year-old female patient. Chilblains (perniosis) are itchy red swellings that result when tissue is damaged by excessive constriction of the small blood vessels below the skin's surface, usually as a result of exposure to cold.
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