penis, on the head of my penis is like a darkish line that run down it has like a bubble of skin over it, its not pussing or anything nasty like that it kind of looks like a vain but some times it isnt bubbled up and i think it got longer too its starting to freak me out
It almost sounds like one of those loop things caused by circumcision. . . but really I have no idea. Good luck with that!