Suggest Treatment For Sinus Infection And Pain In Skin On Back

I have been diagnosed with a sinus infection, and am on 875 amoxicylin. I mention to the doctor that I also had skin pain all over my back, but I don t think she thought much of it as a clue. I have never had pain like this on my skin. I also am taking valacyclovir for genital herpes. Think it is related? I don t seem to have an outbreak.