Why does a deep wound of the scalp always requires stitches?

A deep wound of the scalp requires stitches to promote proper healing and prevent complications such as infection or excessive bleeding. The scalp has a rich blood supply, and deep wounds can lead to significant blood loss if not properly closed. Stitches help to align the tissue, reduce scarring, and facilitate the healing process by providing support to the wound edges. Additionally, closing the wound helps protect underlying structures, such as nerves and blood vessels, from further damage.