The black marks left after wound healing belong to pigmentation, which can be removed through general treatment, medication, physical therapy and other measures. 1. General treatment: avoid sun exposure after wound healing, usually the black marks can gradually fade with time. 2. Medication: local application of azelaic acid cream, hydroquinone cream, cumquat cream ointment and other drugs also have a certain role in assisting the treatment. 3. Physical therapy: If the improvement of topical medication is not obvious, you can take laser therapy, such as intense pulsed light, Q laser, etc., through the thermal effect of laser to make the local melanin broken down and decomposed. Wound healing leaves black marks, need to consult a doctor in time, the drug should be used under the guidance of a professional doctor.