1, simple orbicularis oculi muscle hypertrophy pouch due to genetic factors, lower eyelid pouch when young. Its prominent feature is that it clings to the edge of the lower eyelid, is continuously distributed in an arc shape, and the skin is not slack, which is more common in young people aged 20-32. 2, simple skin relaxation This situation is that the skin of the lower eyelid and the outer canthus is relaxed, but there is no orbital septum relaxation, so there is no orbital septum fat protrusion and fine lines around the eyes, which is more common in middle-aged people aged 33-45. 3. The mild and moderate swelling type of lower eyelid is mainly congenital orbital septum fat overgrowth, which is more common in young people aged 23-36. 4. Moderate and severe lower eyelid swelling is accompanied by lower eyelid skin relaxation, mainly skin relaxation, orbicularis oculi muscle relaxation and orbital septum relaxation, which leads to orbital septum fat prolapse due to gravity. In severe cases, lateral canthus ligament relaxation, eyelid ectropion, eyelid separation and frequent tears occur, which are more common in middle-aged and elderly people aged 45-68.