I don't know, but facial twitching is pretty common... it probably means nothing.
But it sure is annoying, isn't it!
I have had twitching in my left cheek for weeks now. Drives me nuts.
Muscle twitches are more common when we're anxious but can occur for no reason whatsoever. I would not worry about it unless you have other problems/symptoms. Just wait it out; it will go away in its own good time!
Good luck,
Nancy T.