Scars and the tears of stretch marks are caused by injury to the structural proteins in the dermis, namely collagen and elastin. This tearing usually occurs as a result of quick growth or expansion of the skin during puberty, pregnancy or picking up weight very quickly. Not every individual is prone to stretch marks or excessive scarring, as genetic factors play a part in this.
Simply put, if more growth factor is present in the skin at the time of injury, less scarring follows repair. Vitamin A increases the relative amount of growth factor as does skin needling. Vitamin C is another essential molecule for the production of good quality elastin. Vitamin A and C are the most essential agents to ensure good collagen production and the rapid healing of the skin.