The more common reasons for the lack of luster of the skin are skin photoaging, bad habits, malnutrition, or diseases associated with other systems of the body. 1. Skin photoaging: skin long-term repeated exposure to solar radiation and lead to, daily do not pay attention to sunscreen or skin care crowd will be more obvious, skin aging will gradually aggravate with age. The lack of luster is one of the manifestations of skin photoaging, but also at the same time with age skin metabolism decreases, sebaceous glands secretion of oil will reduce the amount of related to skin dryness; 2. bad habits: daily irregular work and rest time, year-round contact with electronic screens and other radiation, easy to slow down the skin metabolism, affecting the skin keratinocyte generation rate, making the skin old, waste keratin can not be normal shedding, but also make the skin has no luster; 3. Malnutrition: excessive weight loss, daily diet with irrational, resulting in the body in a state of malnutrition, can not supply the skin nutrients needed to make the skin has no luster; 4. Diseases of other body systems: some systemic consumptive diseases (such as tumors, endocrine metabolic diseases, digestive diseases, etc.), and liver diseases (such as chronic hepatitis and cirrhosis of the liver, etc.), some of them will have no luster of the skin phenomenon. The lack of skin luster is caused by a variety of reasons, if in the adjustment of work and rest, pay attention to balanced nutrition, appropriate physical exercise and pay attention to the sun and other measures, but still do not see significant improvement, it is recommended to go to a formal medical institutions as soon as possible for examination, so as to be able to clearly diagnosed, and then according to the situation of the doctor under the guidance of the adoption of the appropriate solutions.