When fat tissue is worked and the cells shrink, wouldn't it make sense that your skin would shrink as well? Yes and no. In the cases of moderate weight loss, skin can certainly shrink back to fit the body's new size because of its elasticity due to collagen in the skin. However, collagen does have its limits. Collagen fibers weaken with age and results in wrinkles. Rapid growth or weight gain also outpaces collagen production in the skin causing areas to over-stretch, leading to stretch marks co Matlinglass mmonly seen in pregnancy and adolescents going through puberty. In cases of massive weight-loss, the skin that has been stretched has lost its collagen strength making it very difficult if not impossible for the extra skin to shrink back to its former shape. Those undergoing gastric bypass surgery or bariatric surgery feel this pain. As the number of patients going through weight loss surgery increases, so do corrective surgeries for the unwanted and uncomfortable skin. This extra skin can actually be a serious problem and can actually cause infections, rashes and even back problems.