Hello, my question has to do with a small red dot I have on the rim of my penis. Theirs only one red dot and on the other side of the rim it looks red and irratated. Also every couple times a month I have problems urinating so I'm very worried. I've gotten an STD check and nothing came up, I'm thinking maybe a false positive so I'm going for a second check up in a couple days. I just wanted to know if anyboy had any idea's. Also it has no pain hardly ever but an itch once in a great while. I have no idea what this is and I haven't slept with anyone in 4-5 months out of fear of maybe having an STD. someone please help?

Mosquito bite?