What are hives?
Hives are raised welts that can appear anywhere on your skin and are usually itchy. The medical term for hives is urticaria. Hives are usually red or skin-colored, and they vary in size from a pea to a dinner plate. Look for a reddish halo surrounding the border of these itchy skin plaques. Hives are most often triggered by the release of histamines in the skin, which causes localized swelling, burning and itching. Hives can result from allergic reactions or may be due to many other conditions.
Individual welts or spots usually w