Contray to gasman's post, Calimine Lotion DOES work, and its cheap. The absolute BEST remedy is to blot Chlorox bleach on the rash. It does burn somewhat at 1st, but then never again. Now tell me that Chlorox won't work, Einstein... Been there, done that.

IMO, the absolute worst thing to do would be adding HOT water. Anyone with 1/2 a brain would know better than to add heat to a rash..... Duh.