Explained, stretch marks on your skin

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Stretch marks are results of the stretching of the middle layer of the skin called the dermis. The dermis stretches in order to fit a new and bigger body. As a result, microscopic bleeding and tissue inflammation happens and these would create reddish-purple lines. As a consequence of this, the epidermis also stretches making the lines more visible. When these lines heal, the scar itself is created which is of lighter shade than the natural skin tone.

It was shown in previous studies that stretch marks could be associated with the levels of cortisol in the blood. Cortisol, the most common example of a group of steroids called glucocorticoids, is released by the body at above-normal amounts when the body is under stress.

Excess amounts of cortisol could inhibit the formation of elastin fibers and collagen from fibrolasts, which are both needed to keep new skin firm. As a consequence, the dermal and epidermal layer of the skin could tear easily due to the absence of these supportive substances.

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