Hi again. I just remembered I once had a burning blistering rash on one side of my back that lasted about a week. I think it was shingles ( I had the chicken pox as an adult) but it went away rather quickly so I didn't see the dr about it to confirm. I wish I had, but I had no fever and thought it was just a flea bites or some kind of rsd reaction to me sweating. When I sweat I sometimes get a rash under my armpits. I know TMI, sorry. It goes away in about a week. But this one time I had blisters and it burned really bad when I scratched it. Anyway, you may want to check about shingles or an allergic reaction like Nanc said. I notice I get more sores and rashes since I've had rsd. My pm dr said that rsd could be the culprit because it attacks the skin as wells as our muscles and bones. I hope whatever it is that you can get rid of it and feel better soon.