Could I have scar tissue from SculpSure?

Sculpsure is very unlikely to cause “scar tissue”.  It can produce nodules in the subcutaneous fat, (they feel like fatty lumps) however these can be massaged out and will get smaller over time. Sculpsure is not intended to remove or prevent cellulite, but on the other hand it does not make cellulite worse (if anything, it would be more likely to help or have a neutral effect in the areas treated).  If you are having pain from the waist to the knees I recommend seeing your doctor to determine the cause. It doea not sound like scar tissue would be the cause of this.  

As you probably know, SculpSure is a treatment that destroys fat cells permanently and noninvasively. Therefore, it is very unlikely that you have scar tissue. What can happen, however, with SculpSure, is that you develop nodules, collections of clumped fat cells that can feel like prominent bumps. These, unfortunately, can last for months. 
They usually resolve within a few months, but I have seen them last for over a year in rare circumstances. The best way to try to get rid of them is to massage the lumps to try to break them up and drink plenty of water (about half your weight in ounces) so that your circulatory system can clear them up. The good news is that they are not dangerous, and are likely to resolve.
Good luck!