The fat can "take" irregularly and lead to asymmetry or lumpiness. Infection is possible but rare. Bleeding with significant bruising occasionally. The graft might not take and make the benefits temporary.
Risks of fat transfer 1: infection 2: Bleeding 3: hematoma 4: Lumpiness 5: No take of the graft or partial take of the graft 6: need for further surgery. ( you are fully responsible for the cost of any surgery incluing the surge's fee, anesthesia fees. facility or hospital fees.) 7: injury to nerves or blood vessels 8: fat embolism 9: putting too much or too little 10: blindness 11: skin necrosis