i just had some suspicious spots removed from my leg. it has been almost a month and they are fading but it takes a while for the marks to go way. they went away on their own. i did nothing to make them go away. my girlfriend use to get ulcers in her mouth and used liquid nitrogen to burn them so they would heal better. but you can't see scarring in the mouth. liquid nitrogen is safe if you know how to use it. if i were you i would go back to the derm and have him do the nitrogen thing.