Stretch marks

Stretch marks, also known as striae or striae distensae, are a form of scarring on the skin with an off-color hue. Over time, they may diminish or change in appearance, but will not disappear completely. Striae are caused by tearing of the dermis during periods of rapid growth of the body, such as during puberty or pregnancy, in which they usually form during the last trimester.

Usually on the belly, these striae also commonly occur on the breasts, thighs, hips, lower back, and buttocks.
Pregnancy-related striae are known as striae gravidarum.
Striae may also be influenced by the hormonal changes associated with puberty, pregnancy, bodybuilding, or hormone replacement therapy.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 2.5

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