Aquagenic urticaria is a rare condition where skin contact with water causes a person to come out in a raised, itchy rash. Urticaria, otherwise known as hives, simply describes an allergic skin rash, which is itself a relatively common complaint. Aquagenic urticaria specifically refers to this reaction as a symptom of water allergy - and this is much more unusual.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/aquagenic-urticaria-living-with-an-allergy-to-water