The skin around the eyes is more sensitive, plus people are negligent in caring for the skin here, thus the skin here is exposed to extensive sunlight, and the pigment under the skin under the action of sunlight has become deposited, resulting in the skin here is more dark compared to other parts of the skin. Some people have more or dilated blood vessels in the underlying skin around the eyes due to natural or other stress factors, and these changes are enough to make the skin color darker, thus showing black. External factors When the eyes are hit by external forces, the surrounding blood vessels break down, resulting in skin bruising, which can also lead to dark circles, of course, in addition to blows around the eyes, trauma to the brain can also lead to dark circles, such as fractures in the anterior fossa of the skull, can also lead to dark circles. Fourth, lifestyle habits In addition to the bad habits of staying up late can cause dark circles, there are other factors that can lead to dark circles, that is, cosmetics, smoking, excessive sex, etc.. These factors are mainly to disrupt the body’s endocrine or direct intervention in skin metabolism and cause dark circles under the eyes.