Talk to 3J, he might be able to help.
I also lost around 100pounds & and i was 5"5 at the time, I'm not sure if myn is loose skin or not
I can get really lean, and there is always a little skin that I can pull out and tuck under my cloths..but i never had a 6pack yet, as you drink water or get overweight again, the hang starts coming back on for me..
I hope for you that its not loose skin!