Hi. I am 13-years-old, and discovered yesterday that I have a pimple-like bump near the bottom of my penis. I can't really say if it is on the back or the front, because I really don't know which is which. It's not on the side facing myself, but the other side facing away. Anyway, when I found it yesterday, it was white, and obviously filled in a white subsance, looking a lot like pus or ***. I squeezed it and drained it of the fluid, so now is it just a pinkish, small bump. There are no side affects to it... It doesn't hurt when I urinate or anything. I can hardly even tell it's there, unless I touch it. I, of course, have never had sex, but I'm still worried that I may have some type of desiese. Is there any way that that is possible? I do masturbate frequently... And I have never heard of having a pimple on the penis...

Please explain what this could be, and what I should do to get rid of it.