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It's been almost 2 years since I got an injury on the left side of my head after severely hitting my head in a metal bar. After this event the hair on that area slowly started to fall, to the point where it led to a small bald patch. Although not that visible, I noticed there has always been small, thin, weak hairs growing but they never reach a terminal length. With dermarolling could I be able to regrow? I only wear my hair faded on the sides because I get really anxious showing that spot when the hair grows. Thanks