Hives, also known as urticaria, are swollen, pale red welts that appear on the skin after an allergic reaction. Hives can be caused by an allergic reaction to almost anything, including insect stings, medication, chemicals in food, stress, even sun exposure. Hives form when blood plasma leaks out of blood vessels in the skin. This occurs as a result of a reaction to histamine, a chemical released from cells along the skin’s blood vessels.

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