Unfortunately, skin will not bounce back in its pure state if   it'sbeenstretched by rapid growth due to pregnancy, weight   gain, or extreme weight loss. Instead, it becomes decorated   by a form of scarring called stretch marks, or striate. Stretch   marks often start off as reddish or purplish in color, then   become glossy skin that appears streaked in silver or white.   Stretch marks occur in the dermis, the elastic middle layer of   skin that allows it to retain its shape. However, when   constantly stretched, the dermis can break down leaving   behind stretch marks.

  Men and women can get stretch marks on several areas of   their bodies, including the abdominal area, thighs, hips,   breasts, upper arms or lower back.