A four-year-old child with a dark yellow face is usually associated with physiological factors, anemia, hemolytic disease and so on. 1. Physiological factors: for example, after being irradiated by sunlight, it is easy to cause pigmentation, which leads to yellowish and blackish color, or it is caused by family genetic factors. 2. Anemia: for example, iron deficiency anemia, thalassemia, etc. When the hemoglobin in the red blood cells decreases, it may affect the color of the face, which leads to a yellowish, blackish or pale face. 3. hemolysis: hemolysis after serious, in addition to cause anemia, may also cause jaundice, such as the occurrence of biliary stasis, can not be discharged in time, long-term accumulation in the body, easy to cause yellowish, black, and so on. Four-year-old children with black and yellow face, may also be liver disease, gallbladder disease, recommended timely consultation with pediatrics, line formal examination, and then according to the results of targeted treatment.