What exactly are stretch marks?
Stretch marks (striae or striae distensae) are scars on the skin that have a pinkish or whitish hue and appear when your skin stretches or shrinks rapidly.
Collagen is a protein found beneath your skin that makes it more elastic and provides support. Stretch marks may appear on your skin as your skin attempts to heal any abrupt change or tear in your skin collagen.
They frequently appear on your stomach, arms, breasts, back, shoulders, torso, hips, buttocks, or thighs. These grooves or lines are neither painful nor dangerous. However, some people may feel self-conscious about their appearance. They become less noticeable over time.