Skin bioscience is a core part of dermatology and brings important guiding principles to skin care and dermatological therapy. Although the investigation of human skin bioscience is not necessarily easy because of the limitations on the use of native human skin, many academic scientists and industrial engineers have been involved in this labored research with their creative ingenuity. In Skin Bioscience: A Molecular Approach, skin bioscience is introduced with a specific focus on the molecular approach. Following the description of the fundamental structure and unique functionality of the skin, the response of the skin to exterior stimulation is described. Furthermore, attention is paid to the beautification and regeneration of the skin. This book provides readers with the molecular knowledge of the skin and stimulates their interest in further investigation and development of skin bioscience.