I've always gently rinsed my mouth out with warm salt water a few times a day to get rid of the chancre sores. Or you could put a teaspoon of peroxide in warm water and rinse. You can get them from irritations in your mouth. I get them if I ever forgot to brush my teeth before bed (remember before LCing when your teeth would get fuzzy? mine did, anyway, but not since I started LCing--another great benefit!!).

take care,

N.