THis has happened to me. I had 1 baby who would do that if I nursed him on the left at night. Any other position fine, but if I forgot and put him on the left while side lying. . . ouch!
Watch if any position makes it worse. Definitly avoid your nomal positions for a few days until it clears up. Maybe use a little antibiotic ointment (and wipe if off before nursing), if it looks red and oozy. If it doesn't clear up see your Doc.
It could be an extra sharp tooth. It may go away or it might not. Change positions and keep your eye on it. You should be fine.
They're not typos. . . I can't spell!