When you say facial tremor, do you mean twitching? How often does it occur? Stress and fatigue can certainly cause the twitching in your face, particularly around the eyes or mouth. It can also be caused by a vitamin or mineral deficiency. Are you getting enough sleep? How is your diet?
I wouldn't worry about the twitching. It may come and go. I sometimes get the twitching in my eyelids. It's nothing serious.
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