According to the Neijing, Chinese medicine believes that the five colors correspond to the five organs, and a dark face is often considered to be a deficiency of the kidneys, while liver disease is often seen as a greenish tint to the face. Looking at the color of the face belongs to the content of Chinese medicine diagnosis, observing the color of the face can determine the vitality of the blood, identify the nature of the disease and determine the location of the disease. 1. Dark color of the face is mostly due to kidney deficiency, if the patient has kidney yang deficiency (deficiency of yang qi of the kidney), water and drink are not transformed, yin and cold are prevalent in the body, and the blood is not warmed, then the face will be dark and dull; if the kidney yin and essence are deficient, yin deficiency and fire (deficiency of yin and essence in the body, and hyperactive fire), the fire will burn the yin and fluid, and the face will not be moistened, then the patient will have a dark face and dry and burnt face. 2. Those who have a greenish color are more likely to suffer from liver disease, mostly due to stagnation of the meridians and poor circulation of qi and blood. The normal color of the face is white and red, if the patient feels that the color of the face is not right, we should seek medical treatment as soon as possible.