Black marks on the buttocks need to be carefully distinguished from the appearance of the black marks. If they grow on both sides of the buttocks where they are often pressed by sitting, they are considered to be related to the melanin changes formed by local friction after sitting for a long time. Individuals will be accompanied by slight keratinization, no conscious symptoms, no pain, no itching, and they can choose to use salicylic acid cream or lactic acid cream if they want to improve. In daily life, do not sit on the surface of hard objects for a long time, and you can use cushions to protect your buttocks, which can prevent the black marks from appearing again. If the black marks are growing after folliculitis and are circularly pigmented, consider a lasting trace caused by folliculitis, you can choose to use vitamin E cream or remove it by spot laser, or you can choose to ignore it, the color will gradually fade in about six months.