Urticaria is a skin condition that affects 1 in 5 people at certain period of their life. It causes intensely itchy, raised patches on the skin known as weals (or hives) that can be round or ring shaped and may join together. They often appear after scratching and may affect the skin on every part of the body. It is caused when histamine and other chemical mediators are released into the bloodstream by certain body cells known as mast cells. The welts are the result of fluid leaking from the skin’s capillaries. While the hives usually disappear within 24 hours,...
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