Congratulations on your weight loss! Loose or sagging buttocks can be tightened via skin/fat excision, commonly called a buttocks lift, posterior lift, or completion beltlift (for those who have had previous tummy tuck). If you look at my Butt Lift Spotlight on this site, or at the photos in my photo section of my profile on this site, you can see a gentleman who underwent a full circumferential beltlift (tummy tuck plus posterior lift at the same operation). You can click on the web reference link below for more examples of beltlift patients, each including the buttock lift you are interested in. Just last week I performed an isolated buttock lift (no tummy tuck) on a woman like you who had lost weight and did not need a tummy tuck, but wanted a lifted, smoother buttocks!
Not all patients will have the result this gentleman has, but your loose skin can be removed and contours improved immensely! The operation takes about 3 hours and is an outpatient procedure in our nationally-accredited (AAAASF) operating facility.
An increasing number of ABPS-certified plastic surgeons have experience with this procedure; call several and ask for more information and consultations before you decide to go ahead. Best wishes! Dr. Tholen