Originally Posted by Rodney

Canker sores are small sores that occur inside the mouth--on the tongue and the inside linings of the cheeks, lips and throat. They're usually whitish or yellowish, sting, and sting like hell when rough, acidic, or salty food comes into contact with them. They can occur singly, but sometimes you get several at a time. In my youth, I sometimes had so many that I couldn't speak comfortably. Size can vary from tiny to a sizable fraction of an inch -- those are the bad ones. They take a week or two to heal -- but it's never soon enough!

But of course you probably have them down in AussieLand, too. What do you call them?