Hair Loss from Blunt Trauma to Scalp?

My husband was smacked by a 2×4 on top of his head and left him with a bald spot, about 2 years ago now. Wondering if there is anything he can try to regrow hair in that spot. (Hes in his 20s)

Thank you.

Did your husband have sutures or staples placed to fix a laceration/cut over the area in question? Often times, areas of sutured/repaired hair can cause strangulation of the surrounding hairs, leading to a bald spot. Although there is no specific hair regrowth treatment for this type of loss, hair follicles can be transplanted into the area in question with good results.