Yesterday while at work I felt the urge to itch the area between my scrotum and anus (which I have felt before since I get mild eczema in that area). I scratch for about 30 seconds and later that evening I noticed a hard blister about the size and shape of a multi-vitamin capsule mid-way between my scrotum and anus. The blister wasn't red but it did hurt to touch. I squeezed it a couple of times to try and burst it, but I was unable to and ended up causing more pain. I applied some steroid cream to the area like I usually do for eczema and went to sleep. This morning when I woke up I noticed some dry white-yellowish pus at one end of the blister. I wiped it off and squeezed the blister to find more pus continue to come out. I squeezed about three times before draining the blister completely.
Right now the blister hurts when I touch it and sometimes creates a pain halfway down my right thigh when I walk taking wide steps. I am a bit confused about it since I don't know what could have brought on the blister. The girl that I have been having sex with claims that she doesn't have herpes, and every time that I have had sex with her I haven't seen any blisters or scaring from blisters!?
I tested myself in August for HSV-1 and HSV-2 and both came up negative and was six months without sex at that point, so the only possible source of transmission would be this girl that I had sex with about 3 times since September.
If the blister isn't dues to herpes then what could this possibly be? I know that I should have gotten a culture done and that I should get retested, but besides testing I wanted to see what people on this forum thought.
Your input is greatly appreciated.