Black marks can be eliminated in about a month after using Adapalene Gel, but how long varies from person to person due to individual constitution. Adapalene Gel is an anti-acne medication used for the skin treatment of acne vulgaris with pimples, papules and pustules as the main manifestations, and also used for the treatment of acne on the chest and back. There will be localized black marks after use, which can usually be eliminated naturally in about a month, but everyone’s physique is different and so is their condition, so the recovery cannot be generalized. During the use of adapalene gel, the most common adverse reactions are erythema, dryness, scaling, itching, burning or stinging, and hyperpigmentation, and the black marks produced by its use can be eliminated in about a month. Those who are allergic to any of the components of the product should be prohibited, and sun protection is required during recovery. It is recommended that patients go to the hospital in time to consult the doctor, under the guidance of the doctor standardized treatment, do not use on their own.