Medically reviewed by Daniel More, MD Pictures of hives, also known as urticaria, can help you to identify these raised, red, ...

Urticaria affects 10% to 25% of the population at some point in their life (Henderson, Fleischer, & Feldman, 2000). It is characterized by short-lived swellings of the skin, mouth, and genitalia ...

Most of these urticarias occur within minutes of provocation, and resolve within 2 hours, with the exception of delayed-pressure urticaria and dermographism which may persist for 24 hours or longer.