Stretch marks are red, whitish, or purple streaks in the skin.

Stretch marks occur when skin is stretched too much over time. The elastic fibers just below the skin tear. This tear leaves streaks of indented skin. The elastic fibers are also weakened by hormones such as cortisone. The hormones are present during pregnancy, with rapid weight gain, or certain medical conditions.

Pregnant Woman
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Stretch marks are common in pregnancy.
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