I had sex with a prostitute about a month or so ago. A condom was used. About 2 weeks ago, I started getting a rash on my upper thigh - but only the right side. It looked like a lot of pimples. I also had one pimple on the base of my penis, and another one on my groin. The pimples on the base of my penis went away after a few days, but some more showed up elsewhere on my groin. This second wave also went away after a few days, and a few more showed up in other areas of my groin. Meanwhile, the rash/pimples on my thigh turned red, but don't appear to be open sores. After about a week, some pimples also appeared on my upper thigh on the left side. Nothing hurts, but the rash itches a little at first and then goes away. One area on my right thigh appears chafed, possibly from this area rubbing skin-on-skin.
So...is this herpes, or possibly a heat rash, or something else? Any thoughts?