I have a small "tunnel" like thing on the top of my penile shaft. I've noticed it before but didn't think anything of it. Then a small brownish/black "seed" like dot or ball formed at the end of the "tunnel". It easily came off when I pulled on it. Nothing has grown back or since. It doesn't hurt, or it isn't sensitive at all. Oh and the tunnel, when pinched is hard, and when I pull the skin taut, its hard, but when i don't do anything, you might not see it. I don't know what it is, i dont think its a sebaceous deposit, but i'm not a doctor. Any help? thanks.