Urticaria; rash on arm

Urticaria; rash on arm

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Credit: DR P. MARAZZI/SCIENCE PHOTO LIBRARY

Caption: Acute urticaria affecting an arm. Also called hives or nettle rash, urticaria is a transient swelling and/or flushing of the skin. The underlying vasodilation & accumulation of tissue fluid in the dermis develops as an allergic reaction, which ranges in size from small spots to patches several inches across; it is intensely itchy & lasts anything from a few minutes to several days. There are a variety of types of urticaria. Contact urticaria, for example, is a weal & flare reaction that lasts for minutes following skin contact with a number of agents such as nettles.

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Keywords: condition, disease, disorder, healthcare, hives, medical, medicine, nettle rash, rash, skin rash, urticaria

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