First Some History:
I don't smoke, drink, or do drugs of any sort. I have only ever had oral sex, never sexual intercourse. This sexual activity has only been with one person and we are both virgins. Last time I had any oral sexual encounter was about 3-4 months ago. To my knowledge, I have never had any symptom of an STD.
I decided to get tested for STDs as a precaution for when I do have sex. I got tested for chlamydia, gonhorrea, HIV, and Herpes. So far the only test I have the results of are Herpes and I was told they were negative for both types.
Yesterday evening I felt a raised, slightly tender (but not really painful) bump very close to the crease near my leg/scrotum. I went to take a close look. It is at a hard angle for me to see it well. I noticed what looked like a pimple head but this bump was bigger (read: more filled) than any pimple I have ever had. Its location prevented me from seeing if it was red or anything. While inspecting, it popped and some brownish/bloody pus came out. It popped very easily, I didn't try to pop it but it did as I looked at it. I squeezed some pus/blood out and then washed the area with soap. I still have the bump and it is still a little tender but it doesn't seem like it is ready to release any more discharge if it is going to. I tried looking up what it could be and I am thinking its a boil but I'm not sure. I've never had something like this in my genital area. Is it possible that it is an STD? I should mention that I trim, but not shave, the hair near/on/around my penis.
Thank you for your help!