There is no such thing as the most effective way to lighten acne marks. Effective ways to lighten include daily care, medication, medical cosmetic treatment and so on. 1. Daily care: usually you can insist on the use of skin care products with whitening, lightening acne marks and other effects; at the same time, pay attention to sun protection, eat less greasy and sweet food. 2. Medication: patients can use topical retinoic acid cream, adapalene gel, tazarotene gel and other retinoic acid drugs, as well as arbutin gel, benzoyl peroxide and other drugs under the guidance of the doctor. 3. Medical cosmetic treatment: you can take fruit acid skin resurfacing, intense pulse light, fractional laser, micro-needle, radio frequency and other medical cosmetic treatment. For scarring acne marks, you can also choose microcrystalline grinding, tissue filling and other ways to lighten the acne marks. Generally, patients with mild acne marks can fade away on their own. Patients need to strengthen daily life management, maintain a healthy diet, and go to the hospital if necessary. Medications need to be used under the guidance of a doctor.