Closed acne, also known as whitehead acne, is caused by the keratinization and blockage of the follicle opening due to androgens and other hormones, which prevents the normal discharge of sebum. The main methods of treatment are as follows: first, topical retinoids, such as retinoic acid cream, adapalene gel, or tazarotene gel, etc., applied point to point to the lesions, once a day at night, for continuous use; second, acne picking can be used, but of course, see must be treated in a regular professional hospital or medical institution; third, fruit acid peeling, or The effect of these methods is good.