Just what is the skin?
The skin is the human body's largest organ, and covers the entire body, representing around 15-16% of body weight. It regulates temperature and permits exchanges with the outside world. Yet it is above all a living organ that is sensitive to the environment, the changes in the seasons, lifestyles, of course, the passage of time. It reflects our state of health, stress, fatigue, and even our blues... To use skin care in full possession of the facts, it's therefore a good idea to know about the skin. Epidermis, dermis, hypodermis: find out more. The skin, situated at the interface between the body and the outside world, consists of three layers. The surface layer is called the epidermis. This is made up of cellular layers, and protects our body against external aggression (cold, wind, pollution, bacteria, etc.) and regulates hydration by limiting transepidermal water loss (TEWL). Below the epidermis is the dermis. With its collagen (for structural support) and elastin fibres (for flexibility and elasticity), the dermis serves as a "support mat" for the skin and also has an important nutritional role. It also contains the sweat and sebaceous glands that secrete the sweat and sebum that are rich in essential lipids for cutaneous hydration. The adipose subcutaneous tissue, or hypodermis, consists of cells specialized in fat storage. It is in this part of the skin that the blood and lymph vessels are situated. The hypodermis provides energy reserves and protects the body from the cold, as it forms a "buffer zone", acting as a kind of "shock absorber".