<unk> , also known as water allergy and water urticaria, is a rare form of physical urticaria in which hives develop on the skin after contact with water, regardless of its temperature. It is sometimes described as an allergy, although it is not a true histamine-releasing allergic reaction like some other forms of urticaria. The condition typically results from contact with water of any type, temperature or additive.
Aquagenic urticaria
Cold urticaria
Solar urticaria
Cholinergic urticaria
Heat urticaria
Pressure urticaria
Delayed pressure urticaria
Adrenergic urticaria