Hi
Thanks for writing to the forum!
The rash could be Herpes Shingles as it came after a course of antibiotic. It could be dermatitis or psoriasis.
Hope this helps. It is difficult to comment beyond this at this stage without examining you. Do consult a skin specialist for this. Please let me know if there is any thing else and do keep me posted. Take care!
I have no answers as to how your rash developed. But I had a pretty severe rash 2 years ago, I'll leave out the details, it was a pretty disgusting rash. I tried otc creams, neosporin, etc.... nothing worked.
My doctor prescribed me a cream called Fluocinonide, I used peroxide to rinse off the area and applied the cream, within a few day's it was gone, but I still have a scar on the side of my knee where the rash was, that's how bad it was.
Hope information was helpful.
AJ