Question: How to diagnose Aquagenic pruritus ?
Answer: How is aquagenic pruritus diagnosed? Criteria for diagnosis include : Severe itching, prickling, stinging, or burning that consistently develops after skin contact with water, regardless of water temperature or salinity; Lack of visible skin manifestations; Reaction within minutes of exposure and lasting anywhere between 10 minutes to 2 hours; Lack of a other skin disease, internal condition, or medication to account for the reaction; and Exclusion of all other physical urticarias, symptomatic dermographism, and polycythemia vera.
Source: GARD