Accident with scar on chin
You should be seen by a doctor to determine what can and should be done. I can't tell without a picture at a minimum
Scarring and follicular injury
Injury to the skin leads to scarring if the injury is deep enough. It will take 6-9 months for full healing to take place and to figure out if the hair in that area will regenerate or not. Often, there is is some permanent hair loss after injury of this manner.Hair transplantation is possible once the area has healed.