Warts are on top of the skin, so it's not that. It may be a freckle or mole, or perhaps you are right about the pencil (though there may be no way to prove it.)
I very much doubt that you're going to have to do anything about this, but to satisfy your curiosity, you may want to show it to your doctor next time you see one.
Take care.
Dr. Rockoff
Never moves or gives me any trouble.
Lynne
Thank you,
jessica&matt1987