whenever i have sex with this girl I get a ingrown hair or pimple looking blister. Any clue to what it might be?

Your alergic to sex.

Not really, how many times have you had sex? It might just be a coincidence. I got an ingrown hair once and I thought it was herpes.

I shit myself.

...its gone now.

.....and your too proud to get an std test? Chems don't lie my friend. Hell, if your THAT paranoid, get a double.....

I thought I had an std once.

I was dating this stripper (bad call), and my penis got red and blotchy and sad. So I went to the doc and he said "Yep you got an std, I'm sending you to a specialist for chem. treatment". Fuck. So I went, and the Specialist told me it was a sunburn, and I should stop tanning so much, and I was a little girl for doing so. Ouch.

STD free though!

There are people who have studied and trained for many years to be able to answer your questions, young Padawan.

We call them 'doctors'.