About three months ago, I had oral sex. A week later, I noticed what looked like a sore a little above my anus. a few days, or even a week after, I noticed a couple of bumps on my buttocks and I just dismissed them to be pimples. The area around the "sore" became red. I thought it was a rash, it would secrete a clear liquid and would make it itch. this lasted for about 1-1.5 months. About three weeks after I noticed the "sore", I came down with a fever (102F) which lasted for a night and a day one weekend--very short. I got tested last week for a variety of STDs (Hepatitis B & C, HIV-1, Herpes Simplex Type 1/2, Chlamydia Trachomatis, Neisseria Gonorrhoeae, and Syphilis), and the tests came back negative for all. I'm worried that I may have something and the tests that I took didn't catch it. Or I may have something completely different than what I was tested for. I'm really hoping that it's nothing to be alarmed about, but if you have an idea of what it is that I could have had, I would really appreciate it if you could let me know.