Black acne marks after acne can gradually fade away on their own, and those who do not fade away for a long time can alleviate the symptoms through general treatment, applying medication, physical therapy and other ways. 1. General treatment: If you don’t pay attention to the care during the acne period, scratching and so on, it may lead to the phenomenon of black acne marks after acne. Usually should pay attention to maintain good habits, avoid scratching, but also need to pay attention to diet, can not eat spicy, stimulating food. 2. Apply drugs: If the patient’s symptoms are not very serious, or leave black acne marks is not too long. It can be treated by applying medicines, such as Vitamin A acid cream, Vitamin E cream and so on. 3. Physical therapy: If the application of drugs can not achieve a better therapeutic effect, physical therapy can also be used to alleviate the symptoms, such as laser therapy, intense pulsed light therapy. The black acne marks left after acne need to be treated under the guidance of a doctor, not unauthorized use of medication.