Thanks for asking the query,
Asymmetry in the face can be due to TMJ
abnormality, there are chances of some neurological abnormaliies also.
I would suggest you to visit Oral and Maxillofacial Surgeon and get a checkup done.
Take an OPG radiograph to look for the condition of the joint.
For treatment of the TMJ , inflammatory medications, application of moist heat towels, rest in some cases and bite splint
therapy can be given.
Hope this helps out.