Can an old scalp scar (car accident) cause hair loss around the actual scar? Can scar tissue under the scalp spread? (photo)

The scar is from 2001. It is in the shape of a 'C'. It starts above my ear, parallel to the ground, and then wraps around to the top of my head. It is similar to a head scar that patients have from brain surgery. The scalp was ripped from my skull and was just a flap until they reattached it. I lost hair around the scar at first but it grew back. Now my hair around the actual scar is falling out and is weak. The actual scalp between the scar is tight and does not move that well.

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