What is causing this master bulge when I clench my teeth? (Photo)

i suggesting waiting 2 weeks to see the ultimate outcome then evaluating your mouth under the office standardized lighting comparing the before and after results.  Best, Dr. Emer.

It appears that your right side which was injected has responded very well.  Based on the picture, your left masseter muscle is now compensating for the weakness on the right side.  Also, you may have a shift of the whole jaw to the left creating a bulge.  I recommend you inject the left side with the same dose.  Since the right side responded well to 10 units, you might not need more than that.

Typically, Botox injections for masseter hypertrophy is performed on both sides not just one side.A full photo showing your right and left side would be helpful both with and without clenching. Also a copy of your provider's record that shows how many injection points and location would be informative.If the right cheek bulge goes away when unclenched, most likely cause is insufficient amount of Botox was given. Typical amount would be around 20 units per side with 4 injection points (2 lower and 2 higher).If the right cheek bulge does not go away when unclenched, I would be concerned about either a small hematoma or even an undiagnosed soft tissue mass that might need further evaluation by a qualified physician.I hope this helps.

This will not get better on it's own. I never inject one side because it can cause a shift in your bite. Also, 10 units is not enough and has caused only a partial relaxation. You need to go to someone more experienced. I would do both sides, at least 20. I would also make sure you don't have a hematoma. You are a good candidate for this.

It is possible that 10 units, not being enough to relax the large masseter, has relaxed a portion of the muscle, causing another portion to bulge when contracting.  If this is the case, additional Botox should be helpful. Your physician will also want to rule out a hematoma.I am also unclear about which side was injected, as you say it was the right side but the left is bulging. If this is the case, your untreated side may be overcompensating for the relaxation on the right, and will likely need to be treated as well.All the best,Dr. Clark

First, I would want to make sure you do not have a hematoma. In addition. I usually inject more than 10 units for masseter reduction per side.

That amount of swelling is disturbing after Botox injection. You should have posted clenched and not clenched pictures after Botox. Nevertheless, return to the injecting doctor for evaluation.Dr H Karamanoukian#RealSelf100 Member

Dear Sweetcaraline:You should return for evaluation. It is very possible this is a small collection of blood called a hematoma and may or may not benefit from aspiration. It is also possible the injection was not deep enough to reach the muscle.I am a bit confused by your description. Was the Botox injected in the side of the new bulge? Was only one masseter injected? The masseter is a large muscle and would require more Botox than 10 units; and usually on both sides. If you feel awkward, please consult with a Board Certified Plastic Surgeon with advanced injection experience to re-examine you! I wish you well!

Most likely you need to have some more Botox injected to correct the issue as 10 units is nowhere near enough. Be sure you are seeing a board certified dermatologist or plastic surgeon