How to slim down a chubby face
Facial fullness is generally categorized into two types: muscular and fatty. For the fatty type, several treatment options are currently available—namely, liposuction and fat-dissolving injections.

If facial fullness results from hypertrophy of the buccal fat pad, surgical removal of the buccal fat pad may be performed.
In cases of muscular fullness—commonly due to enlarged masseter muscles—injection of botulinum toxin can effectively reduce muscle volume.
Another cause of facial fullness is a prominent mandibular angle, which can be addressed via mandibular angle reduction surgery (mandibular angle osteotomy).

These three approaches can significantly reshape facial contours. Often, chin augmentation (genioplasty or chin implant) is combined with one or more of these procedures to achieve optimal, harmonious facial balance and aesthetic results.