Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain twitching under mouth near chin can occur due to causes that can also commonly cause such symptoms like side effects of medication,
Vitamin B12 and
calcium deficiency,
potassium deficiency, traumatic injury or inflammation of
facial nerve that supplies muscles of face,anxiety and panic attacks,
nerve inflammation and infection caused by viruses etc..
I would suggest you to first of all consult your treating Physician and get evaluated and a thorough clinical evaluation can help in diagnosis..
You will be advised to get investigations done like MRI, CT Scan, Nerve conduction studies etc..
You can be advised to take multivitamins along with calcium and potassium supplements..
You can do warm compresses over the lips.
You can also do breathing exercises along with meditation to keep stress minimal..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.