I am currently experiencing this rash now. Today is the second day with it. Yesterday was horrid. Hives, welts and blisters EVERYWHERE. Doctor recommended antihistamines - which of course don't work (its not an allergic reaction). But Doc also recommended Mylanta antacid as a topical treatment. Oh the relief it is awesome - who would have thought you could use Mylanta this way. Much better than calamine lotion. Try it.