Black acne marks specific how long will disappear, there is not a clear time, but with the condition and personal constitution related, generally at least in 2~3 months or so. Black acne marks is due to the local subcutaneous melanin precipitation formation of a pigmentation, under normal circumstances is difficult to subside on its own, but with the passage of time and slowly fade, so it is difficult to determine the time to subside, from the normal situation at least in the 2 ~ 3 months or so, the situation is heavier or the body metabolism of those who are slower time is even longer. In order to shorten the fading time of black acne marks, you can use local topical drugs, laser treatment and other ways. For example, topical vitamin E pills with antioxidant effect and retinoic acid cream that inhibits the formation of melanocytes can be used. Intense Pulsed Light (IPL) can also be used to improve the symptoms of dark acne marks. Since the degree of black acne marks varies and the time for them to fade away may also vary, it is necessary to have a doctor’s consultation to analyze the specific situation.