Definition of Wheal

whealWheal is a raised, blisterlike lesion on the skin that usually results from an intradermal injection such as for allergy skin testing or the tuberculin skin test.

Wheals also may occur in response to insect stings and topical allergic reactions (urticaria or hives). Wheals associated with urticaria typically itch, sometimes intensely.

Wheals usually do not rupture or tear, and gradually fade to smooth, red areas (macules) before disappearing entirely as the body absorbs the fluid they contain.


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