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Do you have any pain or discomfort in the front of the ear on either side?
Especially on the point where the joint of the lower jaw moves - the temperomandibular joint? Can you feel or hear a clicking sound when you place your fingers on the joint?
Do you get frequent headaches?
Sorry for the delay in getting back to you.
The upper lip is supplied by the labial branches of the facial nerve. Any pressure over the facial nerve or the labial branches will cause the type of numbness that you are suffering from.
The most common cause for a pinching of the facial nerve is a condition called temperomandibular syndrome (TMJ) This is condition in which there s inflammation of the joint just in front of the ear. Since the facial nerve enters the face just near this joint, the nerve can also get involved in the inflammation and cause numbness or tingling.
Inflammation can also cause the muscles around the joint to get tense and cause headaches.
Please consult an ENT specialist. You will need a thorough examination as well as tests like Xrays and MRIs for a diagnosis.
You can read more about TMJ here:
I hope this helps.
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