The commonly used topical ointment is based on retinoic acid cream. 1.The starting treatment may be temporarily aggravated for a few weeks, but should be treated continuously for more than 6 weeks to achieve maximum effect. 2. Avoid contact with eyes and nose and mouth. 3.Conception is strictly forbidden during the use of the drug, lactating women must stop breastfeeding during the use of the drug. 4. Avoid sunlight on the medicated area. 5.Apply once a night after washing the face before going to bed. Other things such as sulfur ointment and adapalene gel can also be used.