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Urticaria (Hives)
Definition Urticaria is called medically as hives. Urticaria is also known as nettle rash or uredo. It is a relatively common form of allergic reaction that causes raised red skin welts. These welts can be 5 mm in diameter or more, itch severely, and often have a pale border. Urticaria is generally caused by direct contact with an allergenic substance, or an immune response to food or some other allergen. Hives can be caused by stress. The weal can be a few millimeters or several centimeters in diameter, colored white or red, often surrounded by a red flare, and frequently itchy. Each weal may last a few minutes or several hours, and may change shape. Weal may be round, or form rings, a map-like pattern or giant patches. An episode of hives may last from a few minutes to several hours to several days to several weeks. Each individual welt should last no more than 24 hours. Causes
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