Final answer:
Increased hair growth is not a typical complication after healing by scar formation; instead, scar tissue often leads to reduced hair because it does not support the regeneration of hair follicles. Other common complications include lack of sensory function, contractures and adhesions, and keloid formation.
Step-by-step explanation:
The complications after healing by scar formation can include a lack of sensory function in the area, contractures and adhesions, and keloid formation. However, one potential complication that does NOT usually occur is increased hair growth in the area of the scar. After injury, when the wound healing process occurs, fibroblasts lay down collagen to form scar tissue.
This tissue is fibrous and typically does not allow for the regeneration of accessory structures such as hair follicles. Hence, scars often result in either no hair growth or less hair than was originally present before the injury. On the other hand, contractures and adhesions might restrict movement due to the tightness of the scar tissue. Keloids, which are an overgrowth of scar tissue, can form when there is continued production of collagen after the wound has healed.