What is the cause of skin blackening?

There are many reasons for skin darkening, such as genetic factors, pigmentation after sun exposure, seborrheic dermatitis or acne, pigmentation caused by natural aging, endocrine disorders, weakened metabolic function, radiation, lack of sleep, physical fatigue and psychological stress, poor mood, etc. will directly or indirectly cause skin darkening. Skin blackening this situation, it is recommended that patients had better go to a regular hospital to check, exclude the possibility of disease causes, and then symptomatic treatment according to the results of the examination. Daily life, it is recommended that patients should reduce direct sunlight, go out, use sunscreen tools.