I hav had a rash since sept. it is all over my legs,arms and back. the rash is patchy and causing discoloration. Also some spots are red and blistering. dermatologist took and biopsey and said it was a drug allergy . drugs I am on are nexium ,toprol xl, norvasc , lipator,allpurinol, synthroid and iron tablets. I tried stopping the allpurinol and nexium. any ideas what I should do?