When many acne patients visit the doctor, the doctor may prescribe: retinoic acid cream, adapalene, tazarotene and other retinoid medications. The doctor may not be very detailed about the exact method of use. Today, I will tell you how to use retinoids correctly. Wash your face with a facial wash 3 times a day. Before using retinoic acid medication, wash your face with a face wash, and after 30 minutes, when your face is completely dry, apply a peanut-sized amount of retinoic acid to the entire lesion area, not just limited to the acne. When using retinoic acid medication for the first time, try to use it once every 2-3 days to avoid skin irritation and stinging in some patients. Once you get used to it, you can gradually change to once or even twice daily. Avoid using the medication around the mouth, eyes and nose. Note: Because retinoids are photosensitizing, the medication needs to be washed off early each morning. The purpose of using retinoic acid is to suppress new acne, not to treat the acne that has already grown, so the effect time is slow, about 2 months to see the effect.