The causes of dull skin are complex and generally include congenital and acquired factors. The congenital factors are mainly caused by heredity and determined by genes, while the acquired factors mainly include bad habits, environmental factors, disease factors, etc. I. Congenital factors: dull skin caused by genetics, the skin of such people is inherently dull and rough, with age, the skin may be worse, generally do not need to deal with, when self-consciousness affects the appearance, feasible medical means to care and improve. Second, acquired factors: 1, bad habits: daily do not pay attention to sun protection, sleep deprivation, etc., will also appear dull skin, roughness, etc. It is recommended that this part of the people before going out, should do a good job of sun protection measures, such as playing umbrella, wear sunscreen, etc., at the same time to improve living habits, less late at night, more walking, etc., regular cleaning of the skin, do a good job of hydration; 2, environmental factors: long-term life in the sand, dust, haze, etc. Polluted environment of people, may be due to a variety of particle deposition, pore blockage, etc., resulting in skin dullness, skin sensitivity, etc., need to go out to do a good job of protection or reduce the number of times you go out, if necessary, you can install air fresheners; 3, disease factors: digestive system diseases or chronic wasting diseases such as chronic liver disease, chronic kidney disease, anemia, etc. can cause skin dullness, may appear in a wide range, may also be limited to the eye area The dullness may be widespread or limited to the eye area, cheeks and other parts, often combined with other pathological signs, requiring patients to deal with the cause in a timely manner.