There are many reasons for men’s dark circles, such as increased pigmentation, overuse of the eyes, prolonged late-night sleep, long-term exposure to sunlight, systemic diseases and so on. 1. Increased pigmentation: for example, increased dermal pigment cells, intra-epidermal pigmentation, atopic dermatitis, allergic dermatitis, excessive friction, hyperpigmentation after local inflammation. 2. Excessive use of the eyes, long-term late night: these factors will appear to increase the dark circles under the eyes, such a group of people do not stay up all night, pay attention to eye care. 3. Prolonged exposure of the face to sunlight, long hours by the wind and sun can lead to dark circles under the eyes. 4. Systemic diseases such as chronic liver disease, chronic kidney disease, etc. will appear dark circles more obvious. Men with heavy dark circles under the eyes should actively seek medical attention, do not blindly take medication to prevent the disease from continuing to develop.