Dry skin and lack of water will make the skin tight, which will lead to peeling and even fine lines. The skin is divided into three parts: epidermis, dermis and subcutaneous tissue. The stratum corneum of the outer layer of the skin has a sebum membrane that acts as a moisturizing agent for the skin and is formed by the emulsification of sebum, sweat and epidermal cell secretions. The water content of the stratum corneum is about 10%. If it is lower than this standard, it means that the skin is dehydrated and the skin will have a dull color. Growing age, lack of sleep, excessive fatigue, climate change, etc. can cause dry skin.