To understand the process of healing, we need to have a basic understanding of the way skin functions. The skin has three major layers: the epidermis, the dermis, and the subcutis.
The top layer of the epidermis is actually dead skin. Every few days this layer is shed off and replaced by new cells.
The dermis is a supple layer of connective tissue matrix, which makes up 90% of the skin's thickness. This matrix consists of ground substance composed of mucopolysaccharides (MPS) and other proteins. The MPS play an important role in the tissue regeneration of the skin as they have a stimulating effect on the connective tissue cells.
The subcutis is made up of mainly fat and is responsible for insulating the body, but has no role in the repair of tissue.