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Dermatographic urticaria

Seen in about 5 percent of the population, Dermatographism is caused by Mast cells in the surface of the skin releasing histamines upon light scratching of the skin's surface. The histamines released cause the skin to swell in the affected areas.

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Abstract Localized heat induced urticaria is a rare clinical entity. Other physical urticarial subtypes include cholinergic, solar, cold, aquagenic, ...
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