Muscle strain can cause this, I know (it does me.) But since I have neuropathies, that can too.
I think allergies can cause it. Maybe you're allergic to your pencil eraser or something "stupid" like that (no allergy is stupid though.)
It might be what is called a "tic" facial tics are common... guess you can google that and see if it helps you with information. Good wishes!
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