The most common cause of acne is acne vulgaris, or pimples. The cause of acne is related to high hormone secretion, sebaceous gland secretion, acne bacillus infection and lifestyle. Therefore, when treating acne, it is recommended to avoid spicy, sweet and fried foods, and to reduce the bad habits of staying up late, smoking and drinking alcohol. In autumn and winter when the air is dry, it is recommended to apply a mask more often, once a day or once every other day, so that water and oil are in balance as much as possible, and less oil will naturally reduce acne. If the acne is in the acute stage, with red spots, papules, pustules type, it is recommended to apply clindamycin or peroxymethylphenidate externally, 2 times a day for anti-inflammatory and anti-swelling treatment.