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Hives
Hives are raised, red, itchy, often fluid-filled patches of skin (wheals or welts) that may appear and disappear at random. They range in size from less than 0.6 to 2.5 cm (0.25 to 1 inch ) or more, and they may last a few minutes or a few days.
A single hive commonly develops after an insect sting. Multiple hives often develop in response to a drug, food, or infection. Other possible causes of hives include plant allergies, inhaled allergens, stress, cosmetics, and exposure to heat, cold, sunlight, or pressure of clothing. Often a cause cannot be found.