Fat is a natural material, native to all human beings.
Many times there are deformities in the skin either occurring with age, or as a result of trauma.
Fat transplantation is the process by which fat is removed from an area of the body and reinjected into another body area that has become depressed, thereby lifting the skin and giving a more youthful, aesthetically pleasing appearance. There is no chance of developing an allergic reaction to the material, since it is transplanted from your own body. Most common reactions are short term swelling, and occasional bruising at the injection sites. This technique can be used to recontour the face, enhance the cheek and chin, and correct facial or body deformities. Collagen is a filling material that is used in much the same areas as fat.