If fat is transplanted within a short period of time, such as 10 or 15 minutes, the fat will not be transplanted evenly. It will be concentrated on one side and the fat cells will clump together.
In this case, there is a high possibility that the fat cells will die and the lines will become uneven.
Also, only the specific area where fat was grafted becomes brighter, leaving relatively dark areas. In other words, the skin becomes shaded.