A tummy tuck does not make the legs or buttocks grow larger by itself. It removes loose abdominal skin and may tighten the abdominal muscles, but it does not move fat into the lower body or change how the legs store fat directly. What can happen is that the waist and abdomen look flatter, so the hips, buttocks, or thighs may appear more noticeable by comparison. Also, if a person gains weight years later, fat can accumulate in untreated areas such as the thighs, hips, buttocks, arms, or back. Early swelling after surgery can temporarily affect the lower body, but long-term enlargement is usually related to weight change, hormones, aging, or body-fat distribution rather than the tummy tuck itself. Sudden one-sided leg swelling, calf pain, or shortness of breath after surgery would need urgent medical evaluation.