Stretch Marks are a form of scarring on the skin with a discoloration. It is caused by tearing of the dermis layer.If you recently put on a lot of weight and lost them drastically, you may have developed stretch marks. Other causes includes hormonal changes, pregnancy, bodybuilding etc.
They first appear as reddish or purple lines and eventually fade, leaving a shiny whitish discoloration. Hence, it is easiest to remedy during the early stages of its reddish or purple hue.