When you say masseter, it is medically called masticatory muscle! Masticatory muscle hypertrophy can only be relieved by other methods besides surgery! According to mitigation methods:

First, apply a hot towel to the masticatory muscles for 5 minutes to relax the muscles. Then put the joints of the index finger and middle finger on the masticatory muscles and massage in circles, and your face will feel sour. As long as you persist, it will be effective. In clinic, botulinum toxin is often used to treat hypertrophic masseter muscle. This method mainly reduces masticatory muscular atrophy through neurotrophic effect, so as to achieve the purpose of face-lifting. However, this method is not permanent, and the effect will be better if it is adhered to for a long time!

In fact, if it is not obvious that there is no need to make the masticatory muscles fine, it is good for men to be rough!