Changes in weight during pregnancy or after weight loss by diet or bariatric surgery, as well as aging lead to changes in the appearance of the buttocks. Thus, the buttocks can increase in volume and be accessible to volume reduction by liposuction. An asymmetry in the volume of the buttocks can also exist congenitally or acquired. Here too, liposuction will restore symmetry, the secret of beauty. Some patients may suffer from a defect in the volume of the buttocks or unilateral or bilateral hypotrophy. In this case, an increase in volume by fat transfer or buttock lipofilling will correct this anomaly. As part of cosmetic buttock surgery performed by your cosmetic surgeon in Paris 16 and Paris 11, it is also possible to increase the volume of the buttocks by placing buttocks prostheses. In some patients, it may be ptosis or sagging buttocks due to weight loss or age. In this case, a buttock lift associated with excision of the excess skin makes it possible to tighten the buttock. It will also be possible to simultaneously increase the volume by buttock lipofilling or fat transfer if necessary. It is also possible to tighten and lift the buttocks by placing tension threads under local anesthesia. Bulky buttocks will most often require liposuction usually performed under general anesthesia on an outpatient basis, that is to say with exit the same day. For flat or empty buttocks, it will be possible to carry out a Lipofilling or fat transfer to increase the volume of the buttocks again possible on an outpatient basis. The placement of buttocks prostheses will be carried out more with one night in a health establishment. Restoring tension to the buttocks by lifting may require an overnight stay in a health establishment.