DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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Urticaria. Close-up of urticaria (red) on a 1-year-old male patient following an episode of hand foot and mouth disease (HFMD). Urticaria, also known as nettle rash or hives, is a skin condition in which a rash of itchy wheals or lumps develops on the skin, usually on the trunk or limbs. The wheals appear in a matter of minutes and usually fade after a few hours. Urticaria most often occurs as an acute allergic response, triggered, for instance, by particular foods or drugs. It can also result from heat, cold, sunlight or, less frequently, other medical conditions like cancer. HFMD is caused by intestinal viruses of the picornaviridae family.
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