We all love bright eyes, but as the years pass by, the aging of the eyes comes quietly, and I believe the appearance of bags under the eyes must have troubled many beauty lovers. In ordinary people’s thinking the formation of bags under the eyes seems to be only due to the sagging of the lower eyelid skin, in fact, this is only one of the causes of bags under the eyes, the following we will talk about the causes of bags under the eyes that are not known to the other side. Like the upper eyelid, there is also a lot of fat in the orbit of our lower eyelid, and medically we call them “orbital fat”. The diagram below shows three masses of fat in the lower eyelid: inner, middle and outer. Some of you may wonder, “These fats have always been there, how come they became one of the culprits of eye bags?” In addition to skin and muscle, there are many fibrous connective tissues on the surface of the orbital septum that “bind” the fat, which we collectively call the “orbital septum” (shown below). Due to congenital or acquired reasons, excessive accumulation of orbital septal fat, or sagging of the septal tissues, loss of strength and elasticity, leads to a corresponding weakening of their “binding” effect on the fat, and the fat will bulge out, thus the bags under the eyes will arrive quietly.