The other term used for Aquagenic Urticaria is water allergy or water urticaria. It is rarely diagnosed form of physical urticaria. This usually occurs when the skin corner in contact with water (in some patients even tears, sweat) and causes wheals. They are pin head-small pea sized wheals surrounded by variable sized erythematousflares following skin contact with water on face, neck and trunk, irrespective of temperature or source, pathogenesis of aquagenic urticaria is unknown.