Aquagenic Urticaria (AU) is a very rare type of urticaria in which skin rashes develop following exposure of skin to water. The exposure may be of any form - during swimming, while walking in the rain, washing one’s hands, or taking a shower
Aquagenic Urticaria forms a subset of chronic inducible urticaria, a form of chronic urticaria, in which the signs and symptoms usually occur within a few minutes of exposure to the stimuli (or a known trigger)