There are many reasons for heavy and obvious dark circles under the eyes, such as genetic factors, more pigmentation under the eyelid skin, vascular dark circles, and so on. 1. Hereditary factors: heavy and obvious dark circles under the eyes may be due to heredity, if the parents or the family has the phenomenon of heavy and obvious dark circles under the eyes, then the chances of one’s own appearing the phenomenon will also increase. 2. Higher pigmentation under the eyelid skin: Higher pigmentation under the eyelid skin can also lead to heavy and obvious dark circles under the eyes, especially with age, ultraviolet irradiation or irregular work and rest and other factors, which can lead to pigmented dark circles under the eyes. 3. Vascular dark circles: heavy dark circles under the eyes may also belong to the vascular dark circles, mainly due to the lower eyelid venous plexus is more, so the blood vessels are darker in color, so it leads to heavy dark circles under the eyes is very obvious. There are many reasons for heavy and obvious dark circles, patients should avoid ultraviolet radiation, avoid staying up all night, if necessary, can go to the regular hospital, through photoelectric treatment and other ways to improve the dark circles under the eyes.