The hazards of autologous fat breast augmentation mainly include: pain after surgery, mainly due to excessive amount of fat or too much concentrated fat injected into the breast, followed by pain and cysts, fibrosis or calcification, breast deformation, fat necrosis, etc.; uneven absorption of fat, resulting in local depression or unevenness of both breasts; injury to the capillaries of the breast when fat is injected into the breast, or bleeding due to bleeding caused by the surgeon’s blood clotting disorder and improper postoperative pressure bandaging. In addition, infection may occur after the surgery due to the lack of strict disinfection, contamination during liposuction, fat rinsing or fat injection, failure to treat the fat with medicine during fat rinsing, or local chronic inflammation in the donor and recipient areas that was not detected and treated before the surgery; too many deactivated fat cells injected, or uneven fat injection, too much fat injected at the same level or in the same area, and fat not being in extensive contact with the graft bed. The fat fails to contact with the graft bed extensively and gathers into a lump by itself, resulting in fat liquefaction after autologous fat breast augmentation. In addition, it may be caused by uneven injection or too much injection in the same area causing the fat particles to agglomerate into lumps, and the fat injected in the affected area gathers toward the center, which reduces the volume of the lax fat tissue and is wrapped into a sphere by the breast fiber tissue, or there is no proper massage and shaping after the operation, which does not make the gathered fat disperse, improper pressure bandaging after the operation, or fat cell inactivation and calcification, which leads to the appearance of fiber nodules.