So for as long as I can remember I have had this long piece of skin run down the entire bottom side of my penis. It's attached to my frenulum and runs all the way to my testicles. It's pretty hard to to be self conscious about this while having sexual encounters with woman. If anyone has any idea of what this could be I would appreciate it. I'm a 22 year old male.There are some strange stretch marks beside it closer to my testicles as well. As I hit puberty they started to increase in number. I'll try and post a picture to give you a better idea of what I'm talking about.