Stretch marks are the result of scars that develop when the skin undergoes rapid stretching or shrinking. This sudden change causes damage to the collagen and elastin fibers, which are essential for skin support. As the skin repairs itself, stretch marks can form.
Causes
Common risk factors for stretch marks include having a family history of stretch marks, being pregnant, rapid growth during puberty, quickly losing or gaining weight, using corticosteroids, and using anabolic steroids.