What kind of antibiotics did you get? Did they test you for anything?
Has a doctor actually seen the rash? If you haven't been tested for anything, and a doctor hasn't seen the rash, the antibiotics may make it worse if it's yeast or something fungal.
The slight drip - did they culture that? How often are you seeing the drip?
A rash doesn't sound like herpes, and it would take some serious frottage to transmit herpes to your scrotum, as the skin is really thick there.