Stretch marks are long, narrow streaks, stripes, or lines that develop on the skin. They occur when the skin is suddenly stretched and are extremely common.
Anyone can develop stretch marks, although they tend to affect more women than men.
They can occur on a range of body parts, including the stomach, thighs, hips, breasts, upper arms, and lower back.
This type of scarring happens when the skin cannot resume normal form after a period of intense growth, often due to pregnancy, weight gain, weight loss, or puberty. Over 50 percent of women experience stretch marks during pregnancy.