Weight loss can cause a reduction in stretch marks if it results in a lower body weight that is less than the body’s capacity before gaining weight. The elasticity of the dermis increases as fat cells are reduced or eliminated from the dermis, which may minimize stretch mark formation.
When the skin has to stretch its elastic capacity due to rapid weight gain, it can tear and develop small tears within the dermis. These marks heal themselves as the skin naturally repairs itself, but the healing process results in scar tissue.
More extensive tearing of the dermis leads to larger scars and also compromises collagen fibers. Collagen provides firmness and structure to the skin.