Long dark circles are mainly manifested as dark gray and greenish-black skin around the eyes. Different types of dark circles have different reasons for their formation and need to be analyzed specifically. 1. Pigmented dark circles: can be caused by ultraviolet rays, heredity and other factors, can also be caused by dermatitis eczema, pregnancy and other reasons, can be used externally azelaic acid, hydroquinone cream and other depigmenting drugs for treatment. 2. Vascular dark circles: caused by thin eyelid skin, little or missing subcutaneous fat, can be treated with pulse dye laser, or injected with autologous fat or soft tissue filler to supplement the volume under the eyelid for treatment. 3. Structural dark circles: congenital structural dark circles are shadows formed by tear troughs; acquired structural dark circles can be caused by ultraviolet rays or aging; congenital structural dark circles can be treated by surgically correcting tear trough depressions and cheek grooves; structural dark circles caused by skin laxity and aging can be treated with fractional laser. Long dark circles under the eyes should go to the hospital in time, under the guidance of the doctor, according to the specific circumstances of the treatment.