Detailed answer

Stretch marks, also known as striae, can occur on the stomach due to rapid stretching of the skin. This can happen during pregnancy, weight gain or loss, puberty, or even due to certain medical conditions. The stretching of the skin causes the collagen and elastin fibers to break, resulting in the appearance of stretch marks. They typically start as pink or purple lines and may fade over time to a lighter color. Although they are not harmful, stretch marks can be a source of concern for some individuals. There are various treatment options available including topical creams, laser therapy, and microdermabrasion, which can help improve the appearance of stretch marks on the stomach.