PLASTIC SURGERY
What I have found out is that it depends on a LOT of things such as
Time since surgery (most want you to be more than 18 months Post Op)
Amount of weight lost
amount of pannus hang (how much skin you have at your stomach)
weight stabilizing
if it's deemed medically necessary (such as if it's causing rashes and other skin ailments)
That's just information I've found for the stomach skin removal.
Hope this helps some
Dee dee