I have a brown mark on the head of my penis, how can I get rid of it?!
Man, these people are rude aren't they. I have one too but I don't worry about it. I don't think you should either. But if it really bothers you ask your doctor or see a medical web site like the ones below.
Hope this helps. Good luck!
Wash it, or try non a-n-a-l penetration.
If it is a birthmark, then leave it, makes you who you are!
Or, ignore it. If I had a penis there's no way I'd be putting bleaching creams or alphahydroxy and stuff on it. :| I won't even use them on my face.
Stop sticking it in people's butt. Here's the cure stick your penis in bleach, ammonia, and acetone and then scrub with a brillo pad.
See a doctor
quit playing with markers
GO SEE A DOCTOR THAT COULD BE CONTAGIOUS OR A BIRTH MARK