There are several methods of scar repair. You may be a candidate for a scar revision in which the scar is excised and then closed with a trichophytic closure allowing hair to grow through the scar making it less noticeable. You can also try placing FUE grafts into the scar or micropigmentation. It would be best to discuss these options with a hair transplant specialist in your area to come up with a plan.
The best option would be for you to look into a FUE process. This will be able to remove hair and place it on the location of the scar. Best of luck!
Scalp scar camouflage with hair
This really depends on the length you keep your hair as well as the colour of your hair
if your scar is wide then a surgical revision maybe indicated first otherwise you have 2 options:
1. Use FUE hair transplant to put hairs into the scar
2. If appropriate, micro pigmentation into the scar can simulate hair and break the appearance of the scar
lastly if a temporary solution is needed in certain circumstances then there are camouflage scalp cosmetics eg Dermmatch that can also help