The black marks left after the abrasion healing usually refers to the post-inflammatory hyperpigmentation, usually one month to six months time can subside, and personal constitution, the scope of abrasion and care are related. The black marks left after skin abrasions are usually caused by larger and deeper wounds, or improper care. The metabolic cycle of the skin is 28~30 days, so it usually takes about a month for the black marks to fade. Larger or darker black marks require multiple metabolisms to completely fade away, which takes about six months. After the black marks appear, it is best to go to the dermatology department of the hospital in time, and use medication under the guidance of the doctor. Hydroquinone cream or azelaic acid cream can be used externally to accelerate the fading of black marks. For larger black marks, you can do Q-switched gemstone laser or dye pulse laser treatment. After the skin abrasion, you can use mupirocin ointment or erythromycin ointment to prevent bacterial infection, don’t touch water before the wound scabs, and don’t tear off the scabs to avoid leaving black marks.