your "bumps" are not indicative of an ars rash.
you can test at 6-8 weeks post exposure for a good indication of your status...at that time the result is highly unlikely to change. follow up at 3 months for a conclusive result.
If you think you had a risk get tested in 3 months. Dont go by symptoms.
I don't want to seem stupid or over react about this but I am really concerned. I had unprotected Sex a month ago. Last week I awoke to fund four pime like bumps in my left shin area. They itches like crazy and was really tender to the touch. Puss filled and kinda dark circles around the head of these bumps
I have had unprotected sex yes.
Have you had an exposure?