Hives (urticaria) are an allergic reaction of the
skin that appears as raised, red, itchy bumps of different shapes and sizes.
Patches of hives may combine to form raised, reddened skin over large areas of
the body. Hives are often minor, but they can also be the first sign of a
life-threatening allergic reaction (anaphylaxis) that requires emergency
Sarah Marshall, MD - Family Medicine & Rohit K Katial, MD - Allergy and Immunology
How this information was developed to help you make better health decisions.