A dark circle around the eyes may be caused by lack of sleep, contact dermatitis, drug effects and other reasons. 1. Lack of sleep: If you often stay up late, lack of sleep, resulting in eye muscles are in a state of contraction for a long time, resulting in impeded blood circulation, appearing dark circles under the eyes. Usually pay more attention to rest, moderate exercise, available towel hot compress to relieve the symptoms. 2. Contact dermatitis: contact dermatitis can be caused by contact with allergy-prone substances, resulting in allergic reactions around the eyes, which can be treated with loratadine tablets under the guidance of a doctor. 3. Drugs: If the prolonged use of anti-glaucoma drugs such as trevoprost eye drops, easy to cause eye skin melanin deposits, it is recommended to stop under the guidance of a doctor, while paying attention to rest, generally 2 to 3 months can subside on their own. The darkness around the eyes, exclude the factors of sleep deprivation, actively consult a doctor for treatment, such as the need to use medication as prescribed by the doctor.