wheal

wheal (hwēl) a localized area of edema on the body surface, often attended with severe itching and usually evanescent; it is the typical lesion of urticaria.

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wheal (wl)

n.

A small swelling on the skin, as from an insect bite, that usually itches or burns. Also called welt.

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Wheal

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

Mentioned in: Hives

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wheal

[wēl]

Etymology: AS, walu, pimple

smooth, slightly elevated area on the skin that is redder or paler than the surrounding skin. A wheal usually itches and can change size or shape or disappear within hours. It is the typical lesion of urticaria.

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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.

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wheal (w[h]ēl),

n edematous elevation of the skin or mucosa. See also urticaria.

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wheal

a localized area of edema on the body surface, often attended with severe itching and usually evanescent. It is the typical lesion of urticaria.

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wheal and flare reaction

a central blanching surrounded by an erythematous zone of varying diameter, sometimes with pseudopodia, observed on the skin in response to intradermal exposure to allergen (antigen). A basis for detecting particular immediate hypersensitivities in an individual. Produced following release of histamine from mast cells bearing IgE bound to Fc receptor.