Acne vulgaris is a chronic inflammatory disease of the sebaceous glands of the hair follicles and is cosmetically disfiguring. It can affect people of all ages, but the incidence is higher in adolescents. The development of acne is mainly associated with increased androgens and sebaceous glands, hyperkeratosis of the follicular sebaceous glands, infection by Propionibacterium acnes and secondary inflammatory reactions. It is also associated with endocrine disorders, emotions, irregularities in work and rest, and diet, which can cause recurrent flare-ups. Poor daily living habits can lead to the occurrence and recurrence of acne. For example, if you stay up late for a long time and do not sleep well, if you eat a spicy and stimulating diet, if you like high-fat and high-sugar foods, if you are before the female physiological period, if you use cosmetics improperly or if you do not clean after using cosmetics, or if you take drugs such as androgens and glucocorticoids, all of these can increase sebum secretion and cause acne and inflammatory lesions. Among them, acne-like damage caused by androgens, glucocorticoids and other drugs is called drug acne; acne before the physiological period is called premenstrual acne, which is closely related to the menstrual cycle; acne caused by cosmetics, shampoos and facial cleansers is called cosmetic acne, which can cause narrowing of the inner diameter of the sebaceous secretion duct, mechanical blockage at the opening or inflammation of the follicle opening. To sum up, acne is a multi-factorial disease. In daily life, we should pay attention to moderate labor and rest, eat more fresh vegetables and fruits and vitamin-rich foods, and correct constipation to prevent acne from occurring.?