I Hit My Head on the Sidewalk and Now There’s a Bald Spot Where it Healed

I have a scar from hitting my head on the sidewalk 3 months ago. The gash on my scalp has healed very nicely(thin red line) but there’s a bald spot to one side of where the gash has healed. How long do I wait to find out if hair will grow back there and why is it not bald on both sides of the gash?

If the spot lasts more than 5-6 months, you can probably see someone about treating it. Sometimes a limited transplant can work nicely on scalp scars from accidents.