Back scar questions...
I had a LBL about 3 months ago. I still experience some weird numbness/pulling in the back when I run, but nothing in the front. The scar doesn't hurt, but the area in general feels funky. I'm sure this will go away eventually. It's not so bad that it stops me from running though because its not pain, its more of a numbess.
I'm not sure about removal of skin under the butt. I've never heard of that as its own procedure. I somewhat accomplished it with my LBL though. That's where all my extra butt skin was, and when they pull it up during the LBL, it is essentially fixed.