Where is the tear trough located? Tear trough is a groove that starts at the inner corner of the eye and appears on the nasal side of the lower eyelid. It is caused by atrophy and sagging of the soft tissue at the lower edge of the orbital septum. In some cases, it may even extend to the cheeks. Because of the contrast between the sunken tear trough and the surrounding skin, the lower eyelid tissues look bloated and bulging, making it easy to think of it as an under-eye bag, but in fact that is just the illusion of a deepening tear trough. Tear troughs are generally congenital and often more pronounced in people with thinner skin under the eyes than in the general population. This is because young people have more subcutaneous fat and tighter skin, so there is only a vague outline. However, as we age, the subcutaneous fat shrinks, the skin thins and sags due to reduced elasticity, and the tear trough on the inner side of the lower eyelid becomes obvious, thus revealing the “bags under the eyes”. What causes tear troughs? There is a close relationship between living and eating habits and the aging of the skin and face, for example, staying up late, drinking alcohol, smoking, and drinking too much water (drinking more water before bed) can easily lead to tear troughs. The state of swollen eyes is a sign of aging. There is also a relationship with heredity. The appearance of tear troughs tends to give the impression of haggardness. Modern plastic medicine methods (autologous fat or hyaluronic acid injection fillers) can fill in the tear trough depressions, but the disadvantage is that both autologous fat and hyaluronic acid have absorption problems.