Excessive contraction of the chin muscle fibers can result in a localized sunken or “gravelly” chin appearance, or even a receding chin. By relaxing the chin muscle with Botox injections, the jaw area can be smoothed out, providing a major improvement in appearance, as well as a synergistic effect on lower lip lines. Botox injections for the chin muscle may involve the following risks: 1. The injection itself has the potential to cause adverse reactions including redness, swelling, pain, erythema, and bruising. Surface anesthesia before injection, using a small injection needle, as well as cold compresses after injection can significantly reduce such adverse reactions; 2, muscle atrophy at the injection site, a slight depression and other phenomena, you should seek medical attention in a timely manner to deal with; 3, infection of the injection site, mainly due to the lack of strict disinfection, and a very small number of allergic reactions to botulinum toxin. Cosmetic dose of botulinum toxin injection is very safe, rarely have adverse reactions, generally mild and short-lived. Current research shows that adverse reactions or complications from botulinum toxin are often due to incorrect injection methods, or diffusion of botulinum toxin in the local area. Therefore, it is recommended that candidates choose a professional medical aesthetic institution and have it performed by an experienced physician.