What Causes Rashes Along With Itchy Blotches All Over The Body?

i have textbook shingles symptoms, everything occuring how and when it should. but my rash??? i only had1, a single blister. i began accyclovir and prednisone the day markings began and now week later finishingthem. my rash ok red bumps turn to scabs now pink marks, also red scractch like marks red around, pratically faded now. tiny red bumps. then few dark tiny lines one with single blister, alnost gried up. now im getting red lines and p;nk blotches even 1 purple area now spread here there on body thar disappears quicklt ascame? also noticr barely visable lines like light stretgh marks everywhere symptons were????? and spread out too. dizzy hoy cold low temp itch sting severe pain help