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What is urticaria?
Urticaria is characterised by very itchy weals (hives), with or without surrounding erythematous flares. The name urticaria is derived from the common European stinging nettle Urtica dioica. Urticaria can be acute or chronic, spontaneous or inducible.

A weal (or wheal) is a superficial skin-coloured or pale skin swelling, usually surrounded by erythema that lasts anything from a few minutes to 24 hours.

Urticaria can co-exist with angioedema which is a deeper swelling within the skin or mucous membranes.
Classification of urticaria
Urticaria is classified according to its duration.

Classification of urticaria
Chronic inducible urticaria includes:

Dermographism
Cold urticaria
Cholinergic urticaria
Contact urticaria
Delayed pressure urticaria
Solar urticaria
Heat urticaria
Vibratory urticaria
Vibratory angioedema
Aquagenic urticaria
Urticaria and angioedema