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Stretch marks are a form of skin scarring related to pregnancy, obesity, puberty, and short weight gain. They generally form when the dermis, the middle layer of the skin is stretched more than it can tolerate. Connective fibers within the skin eventually break resulting in disruption of collagen production which causes stretch marks.
The skin is the body's largest organ and has the remarkable ability to expand and contract as needed.
The skin is strong and elastic, but its supporting tissues can be damaged if they stretch too far or too quickly.
This rapid expanding of the skin can lead to stretch marks. Up to 90 percent of women get stretch marks during pregnancy. However, stretch marks can affect people of nearly all ages and skin types.
They often occur during periods of growth and body changes, such as significant weight gain, puberty, and extreme muscle building.