Would ThermiTight be sufficient to tighten the loose skin above the navel? (Photos)

The indent above your navel is likely rectus diastasis where your muscles have been separated. You can improve rectus diastasis somewhat with working on your core in a strategic manner if you are against abdominoplasty. You can often fine pilates instructors or physical therapists that are skilled with this type of core work. As for your skin, it is very unlikely you will have a satisfactory result from any of the non-invasive treatment. These non-invasive treatments can at best give you about 20% tightening (which is not permanent). This is unlikely to improve the appearance of your abdomen enough to make it worth the money in my opinion. Abdominoplasty really is an amazing procedure and would correct both of the things that bother you in the best way. It is a procedure with a scar and downtime, but the trade is awesome! I would really recommend giving it a second look! Good luck.