Cryolipolysis for buttock reduction is a new technique that uses a selective and non-invasive approach to localized fat reduction. It uses a special sensor of the cryolipolysis instrument to locate the selected area, combined with vacuum technology to capture the subcutaneous tissue and perform selective cooling to achieve the elimination of fat cells without damaging the surrounding tissue. There is also the possibility of redness, redness and swelling of the superficial skin after the treatment, and some patients may also feel numbness or pain. However, these side effects will basically resolve within 1-2 weeks and do not cause damage to peripheral nerves, and patients can move around normally. In addition, there is a rare side effect called “abnormal adipose tissue hyperplasia”, which not only fails to slim down, but also causes more fat to appear. The probability of this side effect is about 0.025%, which is extremely rare in clinical practice. Another controversial side effect is hyperpigmentation, which is a darkening of the frozen area, probably due to an inflammatory reaction that can gradually fade. If the surgeon does not operate properly, improper temperature control may occur, and in severe cases, skin frostbite may occur and not recover, leaving scarring. Tissue adhesions, deep unevenness, depressions, local nerve damage, painful pulling, and hyperpigmentation may occur. In some cases, a large number of fat cells may also die prematurely and naturally, increasing the burden on the liver. Therefore, it is recommended that candidates choose a professional medical institution and doctor for cryolipolysis treatment in order to reduce the chance of complications.