Will my hair grow back after craniotomy ?

Thank you for your question.
I do believe that using Platelet Rich Plasma injection can speed up the trichostimulatory process around the scar tissue. If the scar tissue is visible in the frontal area it’s worth considering an early PRP series.
Sincerely
Dr. Shanthala

Usually the scar will end up with no hair growth.  The issue is also how good or bad the scar is with respect to hair loss.  You need an exam and an assessment for possible treatment options such as (but not limited to): (1) Hair Transplantation, (2) Scalp MicroPigmentation, (3) Scar Revision.

It is very unlikely that hair will grow in the craniotomy scars. Depending on where they are placed, the quality of your hair, and how you style it, this may not matter as the scars may remain completely hidden.if they remain visible after 6-8 months don't worry because they can be made less obvious by transplanting hairs into the scars.

In general anyone with surgery performed on the scalp can experience both temporary and more permanent hair loss in the area where the surgery was done.  It takes 6-9 months to know how exactly a given person will heal.  Hair can be lost temporarily with glue but often this is a more temporary kind of hair loss. The only thing a person can do is wait to see how their skin heals. 

These are best treated with either FUE, Scalp micropigmentation (a non-surgical solution) or a combination of both if the scar is wide. The scalp micropigmentation procedure is an amazing process that is non-surgical and results are relatively instantaneous. If will probably replace transplants into these scars in the near future. See web reference below.

I'll answer your question as a hair transplant surgeon and a retired neurosurgeon. A craniotomy scar is no different from any other scar, in that hair does not grow in the scar tissue itself. There is no reason that hair won't regrow in the shaved area around the scar, unless post-operative radiation thereapy is part of your treatment plan. With any luck, you will be able to conceal the scar with the surrounding hair once it has grown back; if not, you could consider having some hair transplanted into the scar itself.