wheal

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wheal

 [hwēl]
a localized area of edema on the body surface, often with severe itching but usually of brief duration; it is the typical lesion of urticaria.
wheal and erythema reaction (wheal and flare reaction) the characteristic local cutaneous reaction consisting of an elevated, blanched wheal surrounded by a spreading “flare” of erythema that occurs within a few minutes at the site of a minor nonpenetrating skin injury and also in response to administration of allergen to an atopic individual; it is caused by release of histamine from mast cells.

wheal

(wēl),
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): hives (2) , welt
[A.S. hwēle]

wheal

(wēl, hwēl)
n.
A small swelling on the skin, as from an insect bite, that usually itches or burns.

wheal

(wēl)
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 those susceptible.
Synonym(s): hives (2) , welt.
[A.S. hwēle]

wheal

a mark on the skin after a skin test, an area of EDEMA.

Wheal

A smooth, slightly elevated area on the body surface, which is redder or paler than the surrounding skin.
Mentioned in: Hives

wheal

(wēl)
Circumscribed, evanescent papule or irregular plaque or dermal edema, 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 people.
[A.S. hwēle]