I had a blowjob 2 months ago and have given about 3 blowjobs since that time. about a week and a half ago I noticed a flat spot on the tip of my penis, not pimple like, no bleeding, no pus, no discharge at all, it was flat to the skin and a little shiny. I also noticed a little itchiness, raw feeling below the head. the spot has disappeared, but the raw feeling is still there. I feel like it was chaffing from masturbating too much and all the poking and proding I've done to my penis hasn't helped matters. nothing feels weird otherwise. I feel fine, no sore throat or sores around my mouth. I guess I have 2 questions: are there any STIs/STDs that I could contract via mouth that would show up on my penis and could any STI/STD take 2 months to show up after having oral sex on me?