I have an 8 yr old son who has come to me showing me red marks on his penis. The largest is about 3mm in diameter, however there are many more much smaller ones that look like dots. They are purplish in colour, have no raised head, white spots. The largest is just flat, almost looks like a mark that he may have got from some sort of trauma (but purple) however that doesnt seem consistent with the others that go all around the penis, like some sort of rash