Tear trough injection is for problems with eye bags and fine lines, the injection contains hyaluronic acids that are injected into the skin. This helps tighten the skin, reduce dark circles, and decreases water retention and puffiness. It also reduces dry skin and fine lines around the eye area. 3 types of Eye bags: 1. Simple round bags under the eye, after time. The eyelid tissue can be thin and loose from fat and water accumulation causing the eye to have bags. 2. Eyelid tear trench refers to the begging of the eye from the lower eyelid by the groove of the nose to the lower outer edge of the eye. Some people can even have it extended out to the cheek 3. Sagging skin is the lower eyelid tissue looking bloated and building. That’s why it's considered as bags under the eyes.