Injection of triamcinolone into hypertrophic scar after hair transplantation? Can i get steroids injected into scar now?

Hi everyone. I've sustained an injury to the right side of my face over the jaw bone 18 months ago. My doctor allowed secondary healing as there was considerable soft tissue damage and advised that i could opt for beard transplantation at a later date. A month ago, I got transplantation done, however during the procedure the doctor opined that i have developed a hypertrophic scar and that he's not sure about the graft survival. Can i get steroids injected into scar now?