There are many reasons for the formation of under-eye bags, such as genetic factors, age factors, traumatic factors and so on. 1. Genetic factors: bags under the eyes have a certain heredity, can show congenital bags under the eyes, the phenomenon of orbicularis oculi muscle relaxation, thus gradually forming bags under the eyes. 2. Age factor: due to ageing, eye skin relaxation, orbital septum relaxation, orbital septum fat bulging and other phenomena, so bags under the eyes can be formed gradually. 3. Trauma factor: due to trauma, the lower eyelid skin damage, ligament contusion injury and other phenomena, will also gradually form bags under the eyes. There are other reasons for the formation of bags under the eyes, it is recommended to do a good job of daily care around the eyes, if it affects the aesthetics, you can choose a hospital visit, under the guidance of the doctor to develop a suitable treatment program, so as to improve the symptoms.