Dark circles under the eyes can generally be distinguished by different morphology, different treatments, and the cause of dark circles, which are periorbital hyperpigmentation. 1. Different morphology: Eye bags are the bulges formed in the eyelid area due to eyelid skin laxity and periorbital fat accumulation. Periorbital hyperpigmentation, on the other hand, refers to the round and semi-circular appearance formed on both sides of the eyes, which is usually brown or greenish-purple in color and has no bulge. 2. Different treatment methods: eye bags can usually be treated by skin incision subcutaneous peeling method and lower lid conjunctival incision blepharoplasty to remove orbital fat. Periorbital hyperpigmentation can usually be treated with medications such as vitamin E, retinoids and other drugs to lighten the pigmentation. 3. Pathogenesis: Eye bags are usually caused by genetic factors, traumatic factors and age aging, while dark circles are caused by endocrine imbalance due to prolonged late-night work and irregular work and rest, resulting in melanin deposition. It is recommended that patients go to the hospital for examination in a timely manner, under the guidance of the doctor for symptomatic treatment, while paying attention to the body rest and dietary patterns.