Can Fraxel Laser Cause Botox to Diffuse to Mouth?

Hi bia,
I have not heard of, or seen this adverse effect with Fraxel, and most of my patients are on Botox at the time of their treatments.
If you had a nerve block there is a possibility that the needle punctured or traumatized a branch of the facial nerve. If that is the case, and it is improving, then it should resolve with time.
Speak with your treating physician before your next treatment, but I do not think that the side effect is due to the Fraxel treatment.
Please let us know how it goes. Be well.

Dr. P

Thanks for your question -
It is unlikely that these issues are related. Botox seven days later should not be able to migrate at all. And even immediately after injection it would be likely impossible for a normal dosage of Botox to travel from the upper third of your face to your muscles of facial expression in the lower third of your face.
In addition there's no mechanism for Fraxel to cause the botox to move.
I hope this helps.

The Fraxel laser is not likely to have altered the distribution of the Botox.
Any stress to the face including surgical trauma, laser or chemical peels may re-activate sub-clinical or latent pox infections which are associated with Bell's Palsy. You may want to consider a prophylactic course of an antiviral medication prior to your next Fraxel treatment.
As mentioned in the other comments, nerve blocks may have injured the nerve, altered the distribution of Botox or caused driect mechanical trauma to the muscle.
Discuss this wih your surgeon.