I m having a lot of anxiety about a petechia-like rash on my trunk and back. It began around January when I was diagnosed with genital HSV1, but I m not sure if this correlates with the rash. A CBC was performed and was normal. I was taking acyclovir when I went for the CBC and I was encouraged to discontinue the medication, as this may have been a side-effect of the medication (the CBC was a few weeks ago). However, some time has passed since the CBC and the rash remains. It looks a lot like faint hickeys, if that description helps at all.