Stretch marks are fine lines on the body that occur from tissue under your skin tearing from rapid growth or over-stretching. The marks form in the middle layer of the skin; when there is a constant stretch, the layer tears, leaving stretch marks. The marks begin with a slightly red or purple shade and then fade, leaving the skin streaked in silvery white lines. It is a common condition that does not cause any significant medical problems but can be of cosmetic concern for some people.
Stretch marks can be visible on body parts including the tummy, thighs, hips, breasts, upper arms, and lower back. This type of scarring happens when the skin cannot bounce back after pregnancy, weight gain, or extreme weight loss. Apart from these reasons, corticosteroid creams, lotions, and pills can also cause stretch marks by decreasing the skin’s ability to stretch.