Hi,
The 2 main non-surgical techniques of tightening loose skin are:
- Unipolar radiofrequency
- High intensity focused ultrasound.
Both these techniques deliver energy deep into the skin to cause new collagen formation and strengthens the underlying supportive structures. Repeated treatments may be necessary to give the best results.
Minimizing further weight loss and building up underlying muscle mass by resistance training will also help optimize the final results.
A full assessment by your preferred aesthetic doctor will help determine your suitability for the above procedures.
Hope this helps!