aquagenic

:  caused by water and especially by contact with water Aquagenic urticaria is a rash caused by contact with water. It is exceedingly rare.—Rebecca Coffey, Discover, May 2012 Aquagenic pruritus is recurrent, intense, diffuse itching upon getting out of a bath or shower, and although no one knows the mechanism, it's a symptom of polycythemia vera, a rare condition in which the body produces too many red blood cells.—Atul Gawande, The New Yorker, 30 June 2008