Masseter Muscle Hypertrophy? (photo)

While an in-person exam would be necessary to definitively make the diagnosis, if the fullness is in fact due to hypertrophy of your masseter muscle, then Botox can safely and effectively be used to reduce the size of this muscle.  

Hi lukest, thank you for sharing your photo and questions. Botox is a great treatment for anyone looking to treat masseter muscle hypertrophy. Botox to this muscle diminishes it's ability to contract as strongly, causing the muscle to decrease in size (atrophy) over time. The effects of Botox last approximately 3-4 months at which time the muscle will slowly begin to regain it's strength and increase in size (hypertrophy). 
I've created a video that reviews treating the masseter muscles with Botox. I hope this information is helpful in your research! 

Masseter muscle hypertrophy may occur over long periods of time because of teeth grinding (bruxism). In other cases, larger masseter muscles may have a genetic cause.Botox injections to the masseter are commonly used to treat bruxism, jaw pain, or headache. Sometimes, Botox can cause atrophy of the muscle as a side effect. I often harness that side effect for patients like you and use it to decrease the size of the masseter. The result is improved facial contour on that side of the face which creates a more symmetric appearance.As I tell everyone, it’s crucial to choose a Dermatologist who is experienced in using Botox to atrophy the masseter. This is the most important decision you’ll make to ensure good cosmetics results with minimal side effects.