What causes small bumps about the size of a grain of sand and itches severely. They are from my ankle to my shoulders mostly on inside of legs, buttocks, waist, and around armpit and tender part of arms. I can t seem to find anything to completely get rid of it. I wash thoroughly, then wash with alcohol on the spots, then use calamine lotion over the top of infected areas. This seems to stop the itching and reduce the bumps but does not clear them up completely. Nothing works topically.