I'm 17 and never had any sexual contact with anyone but I have these little white bumps on my foreskin, only visible when I retract it enough to see the tip of my penis, and they mostly cluster in random spots almost forming lines. But when I retract the foreskin all the way there is none, Basically it is only on the foreskin that urine would touch when I urinate if I don't pull the foreskin back when I do, if that makes any sense.