Grey cheeks indicate lack of oxygen and poor lung function. Patients with hepatitis B who have been carrying the hepatitis B virus for a long time, especially those with cirrhosis, have dark and obscure faces. Because the function of the liver of hepatitis B patients is reduced, metabolic abnormalities for a long time, there may be skin pigmentation, dark gray face, dry, rough skin, loss of normal luster and elasticity, or even a “bronze” face, and interspersed with capillary dilation. Some patients have obvious pigmentation around the eyes, the so-called “panda eyes”, etc. These characteristic changes in the face of patients with liver disease are called “liver disease face”, i.e. the pathological cause of liver disease causing a dark face. So, how to prevent gray cheeks? The following are the prevention methods for gray cheeks: 1. Seek medical attention and medication to improve the condition if necessary. Add more fruits and vegetables rich in vitamin A, C, E, ensure adequate nutrition and sleep, eat more cereals and fresh fruits and vegetables and other high protein and vitamin food, eat more watermelon, apple, lemon squeeze original juice. Eat more cooked carrots, can be applied in small amounts. 2, external oxygen supply in addition to direct oxygen intake, but also includes a variety of aerobic exercise, such as walking, jogging, deep breathing, improve the oxygen absorption environment.