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wheal

Pronunciation: wel

Definition: A circumscribed, evanescent papule or irregular plaque of edema of the skin, appearing as an urticarial lesion, slightly reddened, often changing in size and shape and extending to adjacent areas, and usually accompanied by intense itching; produced by intradermal injection or test, or by exposure to allergenic substances in susceptible persons; also encountered in dermatitis herpetiformis (Darier sign).

Synonym(s): hives2, welt

[A.S. hwele]

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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