What can make my skin feel like burning in my chin or my lips twitch in that same direction? it happens every day several times.

One of the first: things I might think of are issues with calcium and vitamin D or vitamin B12 metabolism. Review your calcium intake and make sure you are getting recommended amounts; perhaps try a little magnesium supplement. You are already taking vitamin D/B12. I think it would be unusual for this to represent a serious neurological disease, but should symptoms persist, consult your Doctor/Neurologist.