This is one of the most common skin problems. Most people have it, and only a lucky, genetically-gifted few are exempt from it.
Stretch marks are long cracks of a different color than the skin surrounding it. Anyone can be affected, but some people are more likely to have them than others. It affects women more regularly than men.
They can come out in different parts of the body, such as the belly, hips, lower back, thighs, upper arms, and breasts. They could be the result of a sudden stretching of the skin.