Stretch marks commonly occur when the skin undergoes rapid stretching or shrinking due to
various factors such as rapid growth, weight fluctuations, pregnancy, puberty, or certain
medical conditions. The primary cause of stretch marks is the stretching of the skin beyond its normal capacity, which leads to the breakdown and damage of the underlying collagen and elastin fibers. When the skin stretches or contracts too quickly, such as during periods of rapid weight gain or growth, the supportive fibers can become weakened or disrupted, resulting in the formation of stretch marks.