Annular urticarial eruption due to a sulfonamide drug
Keywords: Allergy-induced urticaria, Annular pattern, Erythematous confluent wheals, Female, Sulfa drug allergy, Sulfa-induced urticaria, Trunk
Urticaria is commonly called hives, a skin reaction characterised by weals, which are caused by the release of histamine and other vasoactive substances from mast cells. Oedema is located in the superficial dermis in urticaria, whereas the swelling is deeper in the skin in angioedema.
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