I have been tested for STD's in the past, came out clean, and have had sex only with my current gf who is clean as well since. However, on my penis about a half an inch below the head line, slightly to the left, where the skin folds I had a bit of discoloration and thought I had a pimple growing. When I tried to pop it I believe some white stuff came out however the area became red and what looks like an ant bite without the white head. It doesn't hurt, doesn't itch, doesn't grow and the only problem I have with it is that it looks bad. I have been putting neosporin on the area for a few days but nothing has changed. I'm really curious as to what it might be because I'm fairly certain it could not be herpes or a genital wart. It gets harder when I have an erection but is for the most part like the rest of my penis when it isn't erected. Was wondering if it would either go away by itself or if I needed to seek out a dermatologist to get it cleared up.