Since skin is so important, we should protect the health of skin to love beauty. However, we should know that in addition to the inherent factors of the human body, which lead to the decline of skin metabolism and the slow synthesis of collagen, there are indeed many factors that endanger skin health in people's real life. People's internal factors are: (1) psychological factors, such as mental tension, excessive fatigue, lack of sleep, unstable mental state, etc. (2) The diet is unbalanced and moderate, including malnutrition, overnutrition and partial eclipse. The external factors are: (1) climate; (2) air pollution; (2) Ultraviolet rays in sunlight accelerate the aging of human skin, causing many special skin problems and even skin cancer. For example, the skin of people in China, Inner Mongolia and Tibet is generally 8 ~ 10 years earlier than that of people working indoors. And we can't completely avoid the factors that harm skin health. What do we do? We have to rely on cosmetics to protect our skin. The aging of the skin is irresistible, but it can be delayed. Just like an apple, it will shrink quickly if exposed to the sun and wind. If we protect it scientifically, it will still be fresh and beautiful next year. Therefore, to protect the health of the skin, we must first have a healthy psychology and good living habits, be full of confidence in life, and persevere in skin care and beauty.