Acne vulgaris is a chronic inflammatory disease of the sebaceous glands of the hair follicles that is common in adolescence. It occurs on the face, back, chest and other areas containing more sebaceous glands. It is characterized by acne, papules, pustules, nodules, cysts and scarring, and affects the beauty of the face and often leads to aesthetic and psychological disorders. Acne is one of the most common diseases in cosmetic dermatology. Etiology and pathogenesis] The occurrence of acne is mainly related to androgens, increased sebum secretion, hyperkeratosis of the hair follicle mouth, and the action of microorganisms. Genetic factors, certain foods, drugs, cosmetics and other factors can affect, trigger and aggravate the occurrence of acne. Clinical manifestations] The lesions mainly occur on the face, especially on the forehead, nose and cheeks in the center of the face, but also on the back, chest and shoulders. The damage of acne is polymorphic and can be either inflammatory or non-inflammatory. The former includes papules, pustules, nodules, and cysts, while the latter includes seborrhea, open acne, and closed acne. In severe cases, the skin can be left with post-inflammatory hyperpigmentation and scarring. Diagnosis and differential diagnosis] 1. rosacea; 2. occupational acne; 3. facial disseminated milia. Treatment] I. Systemic treatment 1. Antibacterial and anti-inflammatory; 2. Antiandrogenic drugs (for women with high androgen levels); 3. Correction of abnormal keratinization of the hair follicle opening. Local treatment The principle is to remove lipids, dissolve keratin, anti-inflammatory and sterilization. Grade I acne, i.e., more pimples with enlarged pores and darker skin tone, is suitable for fruit acids; Grade II, Grade III acne, i.e., more inflammation and more pustules, is suitable for red and blue light plus skin post. May you stay away from acne. Keep your skin clean and beautiful.