The hollows under the eyes are routinely referred to as tear troughs, and this kind of hollows need to be filled. Depending on the material, there are hyaluronic acid fillers and fat fillers, which are the two major trends at present. Hyaluronic acid is recommended to fill the hollows under the eyes because it is very delicate and more suitable for the fine structure around the eyes, and it will be more flat and intact after filling. Fat particles are relatively large, and the fine position of the orbit is easy to fill fat with inequality or unevenness, etc. Therefore, hyaluronic acid filling is recommended for the sunken situation under the eyes.