The black mark left after scarring belongs to melanin deposition, which can be removed by general treatment, medication and physical therapy. 1. General treatment: patients should control the diet, avoid spicy stimulating greasy food, eat more fresh fruits and vegetables; patients should pay attention to maintain adequate sleep, avoid staying up late, keep a good mood; in addition, after the wound healing, the local should be avoided sun exposure. 2. Medication: patients can apply Vitamin A acid ointment, azelaic acid ointment, hydroquinone cream and other medications locally, which can play a certain role in auxiliary treatment. The above drugs should be used under the guidance of a doctor, and patients should not use them on their own to avoid delaying the condition. 3. Physical therapy: If the improvement of external medication is not obvious, patients can take physical therapy such as laser, such as intense pulsed light, Q laser and so on. Through the thermal effect of laser can make the local melanin broken down, so as to alleviate the symptoms. After the scar left black marks and have the need to remove the patient should go to the hospital in a timely manner, under the guidance of the doctor to carry out regular treatment.