Can Hair Regrow in a Scar?

I have a long scar on my head from an accident that happened just over a month ago. I want to know is there any thing that can be done to make it smaller and reduce the appearance of the scar. also wanted to know if there were any treatments that could make the hair grow back were the scar is?

Thank you for taking the time to review my questions

I looked a the photo you sent, and although I won’t publish it on your request, your scar appears to be about 2 inches long and 1/4 inch wide. This is a scar that has no hair elements within it. The only solution for this is hair transplantation, something that can be fairly easy to do. I have done surgery on patients with cranial scars from brain tumor surgery and even injury scars like this, and they can take a transplant fairly well. This particular scar can not be removed without returning.