Picture of Urticaria
Urticaria, also known as hives, is a skin rash with red, raised itchy bumps. They may also burn or sting. The whelts often last only hours or days and move around, and don't leave any lasting skin changes. Viral, bacterial or fungal infections may trigger hives, and hives frequently recur.
Text Source: American College of Allergy, Asthma & Immunology