DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Chilblain (red, centre) on the toe of a 41 year old man. Chilblains are usually caused by exposure to cold, and are due to constriction of small blood vessels below the skin's surface. The affected area becomes red, swollen and itchy. They generally heal without treatment.
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