I have this small bump on the top part of my penis. it is underneath my Head of the penis.. and i first noticed when i was 16 and was to scared to go .. I havent had sex then.. I know its not a sexual transmitted disease. Could it be extra skin in a ball? its a size of a pencil eraser. maybe a little smaller.. and then there another one that jsust appear lately and its really small..should i be worried?