Stretch marks are streaks formed on the skin because of the stretching of skin or weight changes. They basically show up on the abdomen because of pregnancy or obesity. In dermatology, they are named as Striae.
They are formed because of hormonal changes associated with pregnancy, adolescence, hormone substitution therapy, and so on. stretch marks can be usually seen on the waist, thighs, breast, hips, arms, and buttocks.
How are these stretch marks formed? The skin of the human body comprises of three principle layers: