I lost 50 pounds recently and I have a lot of ugly loose skin on upper arms , upper thighs , belly and back . ( upper arms is the worst ) the kin just hangs there and sags . I lost the weight at a slow pace ( a year) with exercise and a healthy diet . I'm 17 and I'm asking how long should I wait after the those 50 pounds weight loss for it to tighten back ? Like how long before I even consider surgery , all I read on the internet is it takes time , but I at least want to know the approximation of that time.