The causes of double jowls are numerous and include chin skin laxity due to congenital jawbone retraction or developmental defects (original small mandible), facial and neck skin sagging, or fat accumulation from obesity. If confirmed as the result of fat accumulation at the chin, double jowls can be fixed by liposuction. To avoid the probability of skin laxity caused by traditional liposuction, Dr. Chuang utilizes the Ultra-Z lipolysis machine to emulsify superficial fats and then mini-siphons them to remove fats by liposuction machine. This method not only effectively removes superficial fats at the chin and neck but also coagulates collagen and fiber tissues peripheral to the affected site based on the thermal effect of ultrasonic waves, which facilitates skin tightening and effectively avoids skin laxity or loosening after liposuction. Moreover, liposuction only requires a 2-mm incision at the bottom of the chin or earlobes, and if the patient has concurrent buccal hypertrophy, liposuction extends to the face and is completed in one surgery.