A stretch mark is a type of scar that develops when our skin stretches or shrinks quickly. The abrupt change causes the collagen and elastin, which support our skin, to rupture. As the skin heals, stretch marks may appear.
Not everyone develops these narrow bands on their skin. Fluctuating hormone levels seem to play a role. You may also have a higher risk if people in your family get stretch marks.
If you develop stretch marks, you’re most likely to do so during these times:
• Growth spurts that happen in puberty
• Rapid weight loss or gain
• Weight training when you have rapid muscle growth