You do not have a Sexually Transmitted Disease if you have never engaged in such acts. However, if you are worried, you can always go see your General Family Practitioner. It's better to go see a doctor and put your mind at ease than completely write it off. However, I wouldn't worry too much about it in the meantime. It doesn't sound like any disease or cancer.
no, red dot but kinda yellowish is normal
u dont have sex so stop worrying
if u see a red dot and it like a bump or lump...then u in trouble if not then u fine
dont worri, ur situation is normal to all male