Hypertrophic lip lift scar ruined my smile (Photo)

Hello. I had a lip lift done at Motohiko Takesaki in Shinagawa clinic Tokyo. The surgeon did a terrible job, not only did he not wait for the anaesthetic to start working before he started cutting at my face, leaving me screaming on the operating table, he left me with this huge hypertrophic scar with distorts my smile. I've been advised to use steroid injections which I know improve the look of a scar but will they provide stretch and softness to the tissue so that my smile can return to normal?