All cells in human organs have the function of division and regeneration. Wound healing is the result of the synthesis of all cells. Both the dermis and subcutaneous tissue play a role in healing, and relatively speaking, the subcutaneous tissue is the most important. The main reasons are: 1. If there is a wound, the blood supply to the skin will be problematic, and it cannot provide nutrients for epidermal cell division, so people often find skin peeling near the wound. This is the keratinization of the skin caused by the lack of nutrients provided by the body; 2 .Under normal circumstances, subcutaneous tissue divides faster than skin.