I also have self diagnosed Aquagenic Pruritis. But I also seem to be sensitive to cold, especially A/C after being outdoors on a warm day. No rash, nothing….just a nasty I was so itchy after a shower it was hardly worth having one. I connected with the AP group & finally after water testing, changes to hypoallergenic items in bathing & laundry products, hypoallergenic moisturizers….I tried Beta Alanine not expecting it to work but it did!!! Just amazing! My father had this AP & so does my sister. I had it as a Teen & young Adult but then it disappeared after pregnancy for many years. It has come back with a vengeance in the past year. In some cases it can apparently be genetic. I can finally have a shower without feeling it’s like a torture chamber. Beta Alanine has been wonderful for me.