Liver lesions can lead to darkening of the face, diminished function of the liver, jaundice, metabolic abnormalities lasting for a long time, there can be dark skin pigmentation, the face appears dark grey, dry and rough skin, loss of normal due lustre and elasticity, and even a bronze face, and interspersed with capillary dilation. In some cases, the pigmentation around the eyes is obvious, i.e. the so-called panda eyes, etc. Medically, these characteristic changes in the face of patients with liver disease are called liver disease face, i.e. the pathological causes of liver disease causing a dark face.
There are many other causes of darkening of the face, which need to be judged in context.