Lacrimal groove refers to a concave groove that appears on the nasal side of the lower eyelid from the inner corner of the eye, which is caused by atrophy and sagging of the soft tissue at the lower edge of the orbital septum. Some people can even reach their cheeks. Because of the contrast between the lacrimal groove depression and the surrounding skin, the lower eyelid tissue appears bloated and protruding, which is easy to be considered as pouch, but it is actually only the illusion of deepening lacrimal groove.

Lacrimal groove is generally congenital, and people with thinner eye skin are often more obvious than ordinary people. But the lacrimal groove is usually not obvious when young, because young people have rich subcutaneous fat and tight skin, so there will only be a vague outline. However, with the increase of age, the subcutaneous fat is shrinking, the skin will become thinner and drooping due to the decrease of elasticity, and the lacrimal groove on the inner side of the lower eyelid will become obvious, resulting in "bags under the eyes".

The appearance of lacrimal groove is easy to make people feel haggard. Through modern plastic surgery, autologous fat or hyaluronic acid injection can be used to fill the depression. Its disadvantage is that both autologous fat and hyaluronic acid have absorption problems.