Zoneark has herpes. :o
Canker sore, not a cold sore. And try salt, it'll hurt like hell, but it will help it go away.
Spray some old spice on that bastard, and then light it on fire!
Salt. Or this Colgate orabase thing, my mom got it for me works good
Anyone know how to cure a canker sore because i have a huge loving canker sore in the back of my mouth and it hurts so bad i can't even eat. :(