Hives or urticaria causes red and sometimes itchy rash
on the body such as face, neck, trunk, arms
, and legs and perhaps anywhere on the body. They are usually allergic (food, medication and insect stings) but may also be due to infections and stress. Many a times no specific cause for them is ever found. They usually go away on their own, but in sometimes oral antihistaminics (such as cetirizine, loratidine, benadryl available over the counter) may be needed.