I would consult a board certified dermatologist since you should not be experiencing pain and or affect our smile. Please keep us posted. Best, Dr. Green
Botox and masseter injection
This is not a complication that I have seen and I have injected thousands of patients with Botox. I commonly inject the masseters. An asymmetric smile may be caused by Botox diffusing into the risorious or zygomaticus muscles, however, pain at 10 days out is not normal. I would consult with a physician as soon as possible to determine why you have pain. Did you have any pain with your jaw prior to the Botox injection?
Pain related to Botox should be brief and only related to the injection itself. I would suggest consulting with a board certified dermatologist for further evaluation. especially if you are unable to smile. this will be improved in a few months. Best, Dr. Emer
Botox injection into the masseter does not usually cause pain. Any affection of the masster by inflammation or infection would almost always be accompanied by inability to open the mouth freely. The inability to smile is often due to diffusion of Botox to the muscle that pulls the angle of the mouth as you smile. If you are not in the US, consult with a doctor to explore the cause of the pain. The smile problem is temporary as Botox results only last for few months