Hives or urticaria are itchy bumps that appear on the skin. They can be big or small, vary in shape, and can appear anywhere ...

Hives — also known as urticaria — is a skin reaction that causes itchy welts that can range from small spots to large blotches. They can be triggered by many situations and substances ...

"These substances increase blood flow and make small blood vessels leaky, resulting in fluid accumulation and swelling (edema) in the skin layers, which form hives." Those with more sensitive ...