I am 18 year old freshman in college. Year ago i had unprotected sex with a girl who i'm not at all certain was clean or not. The next morning i woke with a small red irritated bump (white at the tip) on the underside of the shaft of my penis. I have many sebacious cysts down there and after some research convinced myself i had nothing to worry about. Eventually it went down. Now i have been dating the same girl for 6 months and we have been regularly having sex. There have been times when that same bump has appeared so i figured it was just a irritable sebacious cyst, Until about a week ago when the thing got much bigger than it ever had, so i went to the student health center. They werent sure but said it could possibly be molluscum conagiosum. I got back to my dorm and reexamined it and just barely rubbed the tip of the bump and a mixture of pus and blood came pouring out. Before it was dark and purplish about the size of a small pea, now it lies flat and pink with a slight dimple in the center. The physician at the health center said it was rare to see just one bump of molluscum but i read that they usually are dimpled. I'm freaking out and dont know if i should tell my girlfriend, im scared she'll be mad that i never said anything sooner. Help