Stretch marks are streak-like scars that develop when the skin stretches too quickly, causing the underlying collagen and elastin fibers to break. They commonly appear on the abdomen, thighs, hips, and arms, often due to pregnancy, weight fluctuations, or rapid growth during puberty. While stretch marks are harmless, they can create visible texture changes and discoloration on the skin. Over time, they may fade, but professional treatments can help improve their appearance by stimulating collagen production and resurfacing the skin.
