Dark face, according to the basic theory of Chinese medicine, is mostly considered to be a clinical manifestation of kidney deficiency, but also related to genetic factors, some people are born with a darker complexion, is a normal physiological phenomenon, do not worry too much. In addition, the dark face is also related to excessive late night, insomnia, etc.. Some people work in a hot environment for a long time, due to long-term exposure to ultraviolet radiation, the skin produces more melanin will also appear dark face situation. Certain diseases can also be seen as darkening, such as long-term insomnia, staying up late, liver cirrhosis, liver cancer, kidney cancer, bone cancer and other diseases can also be seen as darkening. Therefore, once you have a dark face, you should go to the hospital for examination and treatment after a clear diagnosis.