Skin metabolism is a complex ever-going process that ensures healthy, protected, and skin capable of regenerating. It affects all skin concerns because it affects ENERGY RELEASE or what some call Skin/Cell respiration. 
Skin metabolism generally refers to the biochemical processes that occur within the skin cells to maintain skin health, protect against external factors, and facilitate repair and regeneration. Just like other tissues in the body, skin cells require energy and raw materials to function and regenerate. The skin's metabolism is responsible for the production of proteins, lipids, and other molecules, collagen and elastin synthesis as well as the breakdown of waste products.