The vast majority of women grow stretch marks after 28 weeks of pregnancy. The appearance of stretch marks, clinically, is mainly due to the skin’s elastic fibers and collagen fibers are damaged or broken, appearing in different widths of purple stretch marks, after delivery these lines will gradually become white or silver white. Clinically, due to individual differences, not every pregnant woman will have stretch marks, but some women will have stretch marks that do not go away. These stretch marks may appear not only on the abdomen, but also on the inner thighs and buttocks, and do not have corresponding clinical symptoms. It is recommended to keep the skin clean and no special treatment is needed.