For 2-3 weeks now I have had this persistent, itchy, red blotchy rash all over my entire body. I have seen my doctor and have had blood tests ( came back fine) was prescribed flucoxacillin and a course of prednisolone (40mg x 7days). Didn't help at all, I was switched to clindamycin with another 7 days of prednisolone - still no relief. usually the day I get prescribed prednisolone it works wonders as I am a life long total allergy sufferer and asthmatic. Could it be a viral infection? What should I ask my doctor ? Thanks