The hives last for 10 to 120 minutes and do not seem to be caused by histamine release like
the other physical
hives. Water
urticaria is diagnosed by applying tap water and distilled water to the skin and observing the reaction.
Treatment of water urticaria includes epinephrine, antihistamines, or cortisone-like drugs. Itching can be controlled with cold packs or commercial topical agents that contain menthol, camphor, eucalyptus oil, aloe, antihistamines, or cortisone preparations.