Also called hives or nettle rash, urticaria is an itchy, raised rash that may affect the whole body or just a small area of skin. It usually lasts for only a few hours (acute urticaria) but may persist for months (chronic urticaria). Urticaria is usually due to an allergic reaction; sometimes it may be triggered by an infection, stress, or exposure to heat or cold.
Acute urticaria usually clears up without treatment.
Chronic urticaria may be treated with antihistamines to relieve itching. In severe cases, corticosteroid tablets may be prescribed. Avoiding known triggers can help to prevent recurrences

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