Stretch marks are skin scarring that form in the middle layer of the skin also known as the dermis. It is caused due to the stretching of the connective tissue as over stretching makes the collagen fibers weak. This leads to the formation of delicate scars on the upper skin layer. The stretching can result from different things with the major cause being pregnancy. Other aspects that could lead to the formation of stretch marks are rapid weight loss, weight gain, genetics, exercises and hormonal changes.
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