The role of Sai Skin Lubricant Liquid Dressing has the following aspects: 1, it can protect the wound and avoid the friction stimulation of gauze and cotton pads on the skin or subcutaneous soft tissues of the bandage, which can lead to pain or further damage; 2, it can promote the growth of subcutaneous muscular tissues or granulation tissues; 3, it can remove local necrotic tissues. Therefore, clinically it is generally used for larger and deeper wounds, preferably for chronic ulcers with ulcerated necrotic tissue on the surface, accompanied by slow growth of granulation tissue, with the best results.