Stretch marks on the buttocks is a common and normal phenomenon. Stretch marks are caused by the rapid weight gain or hormone level changes after pregnancy, resulting in the subcutaneous elastic fibers and collagen fibers are subjected to large pull or stimulation caused by different degrees of fiber damage and fracture, thus appearing skin streaks. Stretch marks tend to occur in areas where body fat tends to accumulate, such as the abdomen, waist, inner thighs, buttocks, etc. Stretch marks are mainly pink or purplish wavy patterns of varying thickness and length, and can be indented to the touch. Stretch marks will be accompanied by a pulling sensation and a slight itching sensation when they are initially created, and will gradually turn into silvery white atrophic scars six months to a year after the birth. Stretch marks generally have no uncomfortable symptoms and are not life-threatening, so there is no need to take special treatment, and the stretch marks will not be completely eliminated. Women can use medication or laser to lighten the stretch marks, and control their weight to avoid the increase of stretch marks. It should be noted that some disease factors, such as Cushing’s syndrome, can also lead to rapid obesity and the appearance of similar marks, which are usually combined with abnormal signs and require timely identification of the cause and targeted treatment.