Recently, I had some pain during bowel and realized I had a small pimple like thing developed near my anal area. At first, I thought it was hemroids, but didn't get any blood in my stool, nor during my wipe. It's painful when I contract that area, but I didn't feel any lump near the opening of my sphincter. This small pimple is near towars my tail bone opening, but still near my anal area.
I am afraid it being some kind of STD, as I had unprotected oral sex. I tested for HIV, and came out negative. Around this time, I had very minor body ache, and fever. It's been about 3 weeks since. I looked at STD pictures and it doesn't look anything like it.
What could it be?
What can I do? Currently, I am on some antibiotics for my flu like symptoms.