Detailed answer

Stretch marks, medically known as striae, can develop on the waist. When the skin is stretched rapidly due to factors like weight gain, pregnancy, or growth spurts, the collagen fibers in the dermis (middle layer of the skin) can be disrupted, resulting in stretch marks. The waist area, which undergoes significant changes in size and shape, is particularly prone to developing stretch marks. These marks initially appear as red or purple lines before gradually fading to a lighter color. While stretch marks cannot be completely eliminated, there are various treatments available to help improve their appearance, such as topical creams, laser therapy, and microneedling.