Hives are raised, itchy rashes that appear on the skin. The rashes can appear on just one part of the body, or over large areas.
Also known as urticarial, hives can be caused by stress, infections, insect bites, changes in temperature, or allergic reactions to a range of substances and chemicals, including alcohol, pollen, latex, caffeine or certain foods. In many cases, the exact trigger is not found.
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