Facial skin darkening may be related to sun tanning, post-inflammatory hyperpigmentation, chronic liver disease and other diseases. 1. Sun tanning: If you don’t pay attention to sun protection in a summer environment with strong ultraviolet rays, it’s easy to lead to sun tanning of exposed skin, such as the face and neck, arms, etc., which in turn leads to facial darkening. 2. Post-inflammatory hyperpigmentation: If the face suffers from inflammatory diseases such as acne, rosacea, etc., it is easy to leave behind hyperpigmentation after the disease has healed, which can also cause facial darkening. 3. Chronic liver disease: chronic liver disease patients due to a long period of time, easy to cause liver function abnormalities, which will lead to some hormone metabolism abnormalities, resulting in pigmentation in the skin, which will lead to darkening of the face phenomenon. There may be other reasons for the darkening of the face, it is recommended to go to the hospital in a timely manner, improve the relevant examination, a clear diagnosis, symptomatic treatment.