Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Call emergency services if a facial change starts suddenly with:
Drooping or weakness on one side of the face
Weakness or numbness in an arm or leg
Trouble speaking, understanding speech, seeing, or walking
A sudden severe headache
Loss of consciousness or a prolonged seizure
These are not typical features of a simple tic and can be signs of a stroke or another emergency.
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek same-day medical advice if new facial movements follow a head injury or occur with fever, confusion, severe muscle stiffness, difficulty swallowing, or breathing problems.
Prompt advice is also appropriate if the movements began soon after starting or changing a medicine.
3
Does any of this apply?
Book an appointment
Book a routine appointment if the movements keep returning for several weeks, are getting worse, or cause pain, injury, embarrassment, or problems with sleep, school, work, or relationships.
New tic-like movements beginning in adulthood should also be assessed, particularly if there are other neurological symptoms.
Every sign above is quoted from the sofidex article on Facial tics. If you are not sure, err upward — it is always reasonable to be checked.