Detailed answer

Stretch marks, also known as striae, are caused by the rapid stretching of the skin. This stretching can occur due to various reasons such as pregnancy, rapid weight gain or loss, puberty, and growth spurts. When the skin is stretched beyond its elastic limit, the collagen and elastin fibers in the middle layer of the skin can break or tear, leading to the formation of stretch marks. Initially, stretch marks appear as reddish or purplish lines and gradually fade to a lighter color over time. While they are commonly found on the abdomen, thighs, breasts, and buttocks, they can also occur in other areas of the body. While stretch marks are a natural response of the skin to sudden changes, they can be minimized or prevented by maintaining a healthy diet, staying hydrated, moisturizing the skin, and avoiding rapid weight fluctuations.