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Stretch marks or striae (singular stria), as they are called in dermatology, are a form of scarring on the skin with an off-color hue. They are caused by tearing of the dermis, and over time can diminish but not disappear completely. It is a common misconception that stretch marks are solely the result of the rapid stretching of the skin associated with rapid growth (common in puberty) or weight gain (e.g. pregnancy or muscle building) that overcomes the dermis's elasticity. Stretch marks are influenced by hormonal changes associated with puberty, pregnancy, muscle building etc. Although stretch marks are generally associated with pregnancy and obesity, they can also develop during rapid muscle growth.
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