I have battled a severe rash for over a year. Two doctors did not know what it was...Cortizone shots twice almost cleared it up, but it bounced right back. I have tried everything...told the drs. I thought it was a form of shingles and they said no. Clusters of blisters, minute size or one large deep spot and trails leading off from it. Intense itching and discomfort. Legs, outer arms, back, behind knees...etc.