Jaw Pain and Difficulty with Opening the Mouth Post-Botox

There are several contraindications to the use of Botox, including certain neurologic conditions and the concomitant use of certain medications.  In addition, the use of Botox around the mouth is a more advanced application and should be done by a physician with experience and success in this area.  

Once again, I must state that you should only have Botox injected by a highly trained, board certified plastic surgeon with extensive experience in Botox injections (or a similarly qualified dermatologist).  Without examining you, it is hard to give specific advice.  However, it appears that your depressor muscle is out which is giving you asymmetry around your mouth.  Throwing off muscle balance in the face can lead to soreness.  The good thing about Botox is that it is always temporary and will completely go away.  However, you may need several weeks to months for the effect to wear off.  Good luck.

It's not clear why you received the Botox. Was it to address the Bell's palsy or was it to address something cosmetic and unrelated? I have only heard of these symtpoms when a patient was not injected properly for TMJ in the masseter muscle. Her symptoms lasted beyond 4 months. Because your situation may be further complicated by the history or current condition of Bell's palsy, it is recommended that you seek the services of a neurologist.