Urticaria are characterized by dermal edema (wheal, swollen) and erythema (flare, red), also known as hives. Hive lesions typically last less than 24 hours and are usually itchy (pruritic). Hives can appear anywhere on the body and they may change shape, move around, disappear and reappear over short periods of time. Types of hives Acute urticaria (short-term): can develop suddenly and will last less than 6 weeks. About 1 in 6 people will have acute hives at one point in their life. Chronic urticaria (long-term): can develop suddenly and will persist more than 6 weeks. This type of urticaria is uncommon and occurs in only 0.1% of the population. 20% of people with chronic urticaria report still having problems 10 years after its onset.
Physical urticaria
Cold urticaria
Pressure urticaria
Solar urticaria
Cholinergic urticaria
Delayed pressure urticaria
Heat urticaria
Dermatographic urticaria