Last night, I noticed the underside of my penis has a dark line running from the tip of the head to the scrotum. It's just darker than the rest of the skin on my penis; it starts small at the head and widens as it gets closer to the scrotum. Through the middle of this dark section is a smaller vertical line (which looks like a blood vessel). Is it possible that I've burst a blood vessel and bruised my penis?
I didn't feel any pain before - but now have a little discomfort (only when I think about it).
Background:
I've started using a tugging device on my penis in attempts to restore my foreskin. I never use it to the point of pain or discomfort and was quite surprised to see a the dark section.