Acute urticaria is defined as the presence of evanescent wheals which completely resolve within six weeks.[1]:150
Acute urticaria becomes evident a few minutes after the person has been exposed to an allergen. The outbreak of acute urticaria may last several weeks, but usually the hives are gone in six weeks. Typically, the hives are a reaction to food, but in approximately half the cases the trigger is unknown. Common foods may be the cause, as well as bee or wasp stings, or skin contact with certain fragrances.[2]
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