What Causes Swelling In The Testicles After Intercourse?

Hi Doc, a little over a month ago, I had unprotected sex with a 19 year old girl. I am 21 years old. It lasted for 30 seconds-1 minute as I realized that I had no condom on. That was my first time having vaginal intercourse, little sexual encounters throughout my life apart from a couple of blowjobs in the past as I am quite conservative and practicing my Catholic religion.The first 7 days after the event, I felt a slight discomfort in my testicles, not painful though but it did feel slightly different. Not enough to lose sleep over however. I also believed it swelled slightly but everything went away within a week. 8 Days after exposure, I went to get tested through a urine test and blood test for chlamydia and gonnorhea and for any STD s that can be caught in my bloodstream. I told the nurse at the clinic about my testicles but she believes that they can also be anxiety induced (as I am slightly anxious when it comes to these matters). I was told 10 days later that I tested negative and so I don t have chlamydia or gonnorhea. However, Herpes, Syphillis and HIV require to be tested 6 weeks to 3 months after exposure. Last night, there was a pimple on the lower penile shaft. It looked a small lump, slightly red but looked like a pimple that I usually see around my inner thighs away from my genital area. It popped like a pimple with the white zit like pus but with a bit of blood. The lump decreased to around the size of a very small pea, and is still red with hard smooth surface (does NOT appear to be a wart or blister like sore). The pimple does not bother me but the fact that it is on my penile shaft does as this is the first time I see there. Can this pimple have any relation to what happened when I had unprotected sex? Could this be a chancre sore, a symptom of syphillis or any other STI or is it simply a pimple, or cyst or ingrown hair?