Hi, I'm a 20 year old male, with an uncircumcised Penis. Just awhile ago, I noticed the the head of the penis had a slight, almost yellowish, tint to it. It wasn't the whole thing, just a small section of the tip. I drew the conclusion that it was probably due to lack of blood or just cold out. (It looked either yellowish, or possibly even blue) I'm actually very concerned however. I've only have sex with 1 girl, and I believe she had nothing.