Stretch marks are lines on the skin that develop when the skin is stretched too quickly. They usually appear as reddish or purplish streaks, but over time, they may fade to a lighter color. Stretch marks commonly occur during periods of rapid growth, such as puberty or pregnancy, when the skin is stretched beyond its limits. They can also occur due to rapid weight gain or loss.

Stretch marks typically occur when the skin is stretched rapidly due to various reasons such as puberty, pregnancy, rapid weight gain or loss, hormonal changes, certain medical conditions. When the skin’s elasticity is overwhelmed by these changes, it can result in the formation of stretch marks.