What Causes Pulling Sensation Under The Left Side Of Lower Lips?

Today I had this pulling sensation under the let side of my lower lip. When I looked in the mirror there seem to be a shadow there but was a dent this it went away had a little numbness to it, I am 56 years old, 5'4 1/2 feet tall 147lbs. Complete historectomy and stress, On thyroid meds 75mg and to many hot flashes