Eye bags are puffiness of the lower eyelids. Because the skin under the eyes is thin, edema can easily occur, and genetics is an important factor that becomes more pronounced as we age. In addition, poor kidneys, lack of sleep or fatigue can cause under-eye bags. This phenomenon tends to make people look old and haggard. Tear trough is a groove that appears on the lower eyelid against the nose starting from the inner corner of the eye and is generated by atrophy and sagging of the soft tissue at the lower edge of the orbital septum. In some cases, it can 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 eyelids 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.