The meaning of colorlessness is the lack of luster of the facial skin. The glory of the skin color or haggard reflect the vitality of the internal organs and vital energy, to determine the severity of the disease and the prognosis of an important significance, so Chinese medicine attaches importance to look at the color. Looking at the color, refers to the observation of human skin color changes in order to diagnose the method of disease, also known as color diagnosis. The focus of color vision in the process of clinical evidence is the color of the facial skin. Color is the color, that is, the hue change; Ze is the luster, that is, the brightness. The human skin with the fullness of the essence and color, and the essence is generated by the functional activities of the internal organs. Therefore, where the color of the face glory and gloss, for the internal organs of the vital essence has not been weakened, is not sick or disease; where the color of the face dark and withered, for the internal organs of the vital essence has been weakened, is a serious disease. If the patient is not feeling well, it is recommended to consult a doctor in a timely manner to avoid delaying the condition.