The ugly visible lines are often caused by pregnancy, rapid weight loss or weight gain, heredity factors, rapid growth, changes in physical conditions, and stress.
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Particularly, the rapid contraction or expansion of the skin may make the connective tissues stretched, thus forming stretch marks in the middle layer of your skin. Your skin takes time to heal the damage and produce collagen that plays the important role in making your skin look glowing and flawless.
However, the collagen becomes weakened and the collagen production is affected when someone gains or loses too much weight, or grow quickly. No one like their stretch marks because it makes them feel uncomfortable and unconfident.