Medically reviewed by Jurairat J. Molina, MD Acute urticaria (hives) is a common skin condition that affects up to 20% of people at some point in their lives. It can transition into chronic urticaria ...

There are many different types of hives -- urticaria -- with many different causes. In most cases, these puffy, red, or skin-colored bumps and wheals appear suddenly due to an allergic reaction to ...