The use of salicylic acid closed mouth instead of more is due to the salicylic acid’s irritation of the hair follicles, the skin’s reaction is also more obvious, so can appear closed mouth acne elevated situation. Generally can use to improve lifestyle, improve the way to wash the face, apply retinoic acid ointment to carry on the treatment. 1. Improve lifestyle: patients should do a good job of daily cleaning, but do not over-clean. Pay attention to choosing milder skin care products suitable for you to use. Maintain good sleep habits, try not to stay up late, and reduce the intake of high-fat, sweet food. 2. Improve the way you wash your face: The appearance of closed-cell acne is mainly due to a large amount of skin oil secretion, stimulating the skin to breed closed-cell acne particles. So choosing a gentle cleanser to properly clean the skin can reduce the appearance of closed mouth acne. 3. Apply retinoic acid ointment: If the situation of closed mouth acne is serious, you can use retinoic acid ointment, such as retinoic acid cream, adapalene gel, etc., which can reduce the formation of tiny acne by normalizing the epithelial cells of the hair follicle. The use of salicylic acid closed mouth instead of more, to seek medical advice, follow the doctor’s advice to do the appropriate treatment. All of the above medications should be used in accordance with medical advice.