I had bad liposuction to the upper back of my thighs, right below my butt at my gluteal fold. Most of the fat was removed from this area and it is now quite hollow (instead of having fat). Because there is no support, my butt has also dropped down to rest on the top of my thighs. I have had a fat transfer but the fat did not take. Is it possible to inject quite a lot of hyaluronic acid filler and/or Sculptra to the area to help restore the missing volume underneath my butt and provide support?