Is There a Chance Your Skin Can Shrink Back After a Weight Loss of 100lbs or More?

Congratulations on your weight loss journey and taking that step of having a LAP-BAND placed. 
I would see how much weight you lose with the LAP-BAND.  Younger patients have more recoil or rebound to their skin and the skin can shrink wrap around your body after massive weight loss. 
I would wait until your weight has plateaued for at least 3 to 4 months and then evaluate your body to see if you will need surgery.  I have seen patients lose more than a 100 pounds and not require any reconstructive surgery because their skin is relatively healthy and shrink wraps around their new arms, new legs, abdomen, and buttock.
 
Thank you, J. Timothy Katzen, MD, FACS

Thank you for the question.

Congratulations on your successful lap band surgery and your commitment to weight loss and healthy lifestyle.

Unfortunately,  given that you will end up losing over half of your weight  (at least 150 pounds),  it is most likely that you will have  “loose sagging skin”.  Also unfortunately this excess skin does tend to be a reminder of the previous history of obesity even when you reached your goal weights.

There are a variety of plastic surgical procedures designed to eliminate the excess skin when you are closer to your stable weight ( you may find the link below helpful).

At that point it would behoove  you to seek consultation with well experienced board-certified plastic surgeons.

Congratulations again!