I've had this for about three weeks now and am rather fed up of it. It's definitely not a cold sore - it looks more like a slightly crusty paper cut iyswim. I keep putting lip balm on it and trying not to open my mouth, but just as soon as I think it's about to heal it splits open again when I open my mouth too wide.
Short of not opening my mouth for a week, any ideas how to get rid of it? Magic potions etc?