What is best skin tightening procedure in 2020 for loose skin on thighs/butt after my lipo? (Photos)

this is generally a very tricky area of anatomy. I have tried various types of minimally invasive skin tightening treatments such as J-plasma Renuvion and Body-tite but both have had little to no effect.  Thus my gold standard treatment for tightening of the skin at the lower buttock and upper back of the thigh regions is a lower buttock tuck (aka “banana-roll plasty”).  A lower buttock tuck is kind of like a tummy tuck for the buttock in that it removes loose sagging skin from not only the lower buttock but also the back of the thigh to tighten both areas and create a more defined buttock crease. In doing so it also aesthetically shortens and/or rounds out the buttock cheek. It is ideal for those patients that have had significant weight loss or fluctuations, changes from fillers injected, multiple pregnancies, or who’s derrieres have succumb to the dreaded effects of gravity and aging. It is also effective for those whom feel their buttock cheek is naturally too long or square and just want it proportionately shortened and rounded, respectively.  Glad to help  

Our top skin tightening procedures are BodyTite and Morpheus. As always, be sure to research who performs your surgery to ensure the best likelihood of a positive result.

Hello and great question. I appreciate the time you are spending researching this procedure. My name is Dr. Matthew J. Nykiel. I am a Board Certified Plastic Surgeon, a Fellowship Trained Cosmetic Surgeon, and a Breast Augmentation Specialist.
Based on your photos you may be a good candidate for a minimally invasive skin tightening procedure called J Plasma or Body Tite. I recommend an in person consultation to discuss surgical goals. However, the golden standard for skin tightening is still lifting or cutting procedures. 
I hope that helps! Best of luck!