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From Biology-Online Dictionary | Biology-Online Dictionary
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(Science: dermatology) this allergic skin eruption is characterised by multiple, circumscribed, smooth, raised, pinkish, itchy weals that can develop very suddenly almost anywhere on the body.

Have also been known to develop in response to cold, heat, animal dander, insect bites, pollen or stress. Treatment often includes antihistamines and adrenaline. Some individuals may also be given corticosteroids.

Synonym: urticaria.