Black bags under the eyes is not necessarily a disease, may be physiological causes, with the body’s natural aging, excessive use of the eyes, may also be pathologic, with endocrine disorders, dermal melanocytosis related. 1. Natural aging of the human body: with age, the human body will naturally age, the skin around the eyes, muscle tissue relaxation, tear trough aggravation, the muscles around the eyes, fascia can not bind the fat in the eye socket, the fat outward expansion of the formation of bags under the eyes, in the sunlight and under the light of the shadows, that is, bags under the eyes black. 2. Excessive use of eyes: long-term late night, excessive use of electronic products, poor sleep quality and other reasons, may lead to excessive use of eyes phenomenon, the eyes are in a state of fatigue for a long time, which will lead to the accumulation of carbon dioxide in the venous blood around the eyes, a variety of metabolites, the emergence of under-eye bags and dark circles. 3. Endocrine disorders: endocrine dysfunction exists in the body, which can lead to an imbalance in the level of hormones in the body, affecting the normal blood circulation around the eyes, which may result in dark bags under the eyes after a long period of time. 4. Dermal melanocytosis: patients with dermal melanocytosis, resulting in excessive deposition of melanin in the dermal cells, the skin around the eyes manifests a grayish appearance, there will also be dark bags under the eyes. Non-disease-induced black bags under the eyes generally do not affect the health, do not need treatment, disease-induced black bags under the eyes to go to the hospital after examination targeted treatment.