A normal person’s face is slightly yellowish with redness, full of spirit, natural expression, and slightly shiny. A grayish face is common in chronic hepatitis and lead poisoning. Usually in Chinese medicine, a dark and lusterless face is a symptom of weak lung qi. If cold qi and blood pass up through the meridians and are injected into the face and manifested, the strength, weakness and good operation of qi and blood will definitely be seen in the face color. The following diseases are the causes of the gray face: 1, post-hepatitis syndrome Post-Hepatitis Syndrome (Post-Hepatitis Syndrome), is the healing of viral hepatitis after the emergence of a comprehensive disease characterized by plant nervous disorders, also known as recovery period hepatitis syndrome (Convalescent Hepatitis Syndrome). 2.Lead poisoning Lead and its compounds are toxic to all tissues of human body, and the poisoning route can be through inhalation of its vapor or dust from respiratory tract, and then phagocytes in respiratory tract carry it to blood rapidly; or absorbed through digestive tract and enter blood circulation. People who are poisoned usually have a history of exposure to lead and lead compounds. Oral ingestion of 2-3 grams can cause poisoning, and 50 grams can cause death. Clinical lead poisoning is rare. Neonatal hepatitis includes hepatitis caused by hepatitis B virus, cytomegalovirus, herpes simplex virus, coxsackievirus and rubella virus, etc. It can also be caused by ECHO virus, EBV, Toxoplasma gondii, Listeria monocytogenes or various bacteria. These pathogens can infect the fetus through the placenta and also during or after delivery. A few cases are related to congenital metabolic defects. 4.Pediatric lead poisoning Lead and its compounds have toxicity. In addition to metallic lead, there are many compounds of lead, such as lead monoxide, lead trioxide and lead dioxide. Lead is a heavy metal element with multi-system toxicity, which is especially sensitive to children who are in the growth and development period. Lead poisoning can cause irreversible neurological damage in children, and its neurotoxicity has no threshold and can often cause impairment of children’s intellectual development and affect their behavioral development and physical growth before there are obvious clinical manifestations.