on my penis and ball sack there are little yellow dots, i have no idea what it is and i only noticed them when i was 10 (i'm 13 now). you can see the dots on my ball sack all the time, while you can only see the dots on my penis when i have an erection when the skin is thinner. what are they? i sometimes masturbate with friends/suck there penis/thrust my penis into they're ass so if its a std i don't know how ill tell my parents. any1 have an idea what it is?