• STRETCH MARKS ARE CAUSED BY RAPID SKIN STRETCHING ,WHICH LEADS TO A BREAKDOWN IN THE SKIN'S COLLANGEN AND ELASTIN FIBERS ,THIS CAN BE DUE TO VARIOUS FACTORS SUCH AS ;PREGNANCY, WEIGHT GAIN OR LOSS,PUBERTY ,MUSCLE BUILDING OR GENETICS

Stretch marks are zebras that form on the skin when elastin and collagen fibers stretch and the skin tears. More or less deep and wide, they appear on the belly, chest, lower back, arms, hips, buttocks and thighs. They concern women as well as men, but to a lesser extent. They are more common during adolescence and pregnancy. When they appear, the stretch marks are red because of an inflammatory mechanism, then they whiten after healing.