Today I noticed a dark pink spot about a 1/2 CM wide on the inside of my foreskin when it's pulled back. So, it's not on the tip of my penis, but rather on the shaft. Its about a 1 CM away from the head of my penis. It looks flush with the skin. It does not burn, itch, sting, or anything. No discomfort feeling whatsoever. I did, however, start to experience a slight itch on my anus. I did receive unprotected oral sex about 2 weeks ago.