Physical urticaria

Published on 05/03/2015 by admin

Filed under Dermatology

Last modified 05/03/2015

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Physical urticaria

DDx Ref       242597

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Stroke the skin of any patient complaining of hives. Most patients with dermographism will form a wheal and red flare minutes later. This establishes the diagnosis. No other tests are required.

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Pressure urticaria. Swelling may occur hours after the application of pressure. Many patients with chronic urticaria also have pressure urticaria. Antihistamines may not be effective.

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Cholinergic urticaria. Round papular wheals occur shortly after exercise or exposure to heat. These ‘heat bumps’ are very common in young adults.