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Stretch marks are often the result of the rapid stretching of the skin
associated with rapid growth (common in puberty) or weight gain (e.g.
pregnancy, muscle building, or rapid gain of fat) or in some cases,
severe pulling force on skin that overcomes the dermis' elasticity.
Between 75% and 90% of women develop stretch marks to some degree during
pregnancy. The sustained hormonal levels as a result of pregnancy
usually means stretch marks may appear during the sixth or seventh
month, primarily during the 3rd trimester, as that is when skin tends to
be subjected to higher levels of stretching forces.
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