Stretch marks are visible lines on the skin, which usually appear in the abdominal wall, over the thighs, upper arms, buttocks, and breasts. This cosmetic issue can cover large areas of the body. We all know that the skin has three main layers: Epidermis (the outer layer), Dermis (the middle layer) and Subcutaneous or Hypodermic (the deepest layer). The stretch marks form in the dermis when the connective tissue is stretched beyond the power of its flexibility. As a result, the collagen is weakened and its normal production cycle is hindered and damaged.