Transplanting Into Burn Tissue

does hair transpalnt work if you had a 3rd degree burn on the back of your scalp the size of a silver dollar?

Yes. However, there may be a blood supply issue and the growth to a scarred or burned tissue may not be as optimal as normal skin. Alternatively, if the scar is small enough, you may explore the option of a scar reduction or other creative type of surgery in the hands of an expert who knows about scalp scars.