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, staying up late for long periods of time, poor sleep, a spicy and stimulating diet, and a preference for high-fat and high-sugar foods can cause acne to occur. Premenstrual acne in women is called premenstrual acne and is closely related to the menstrual cycle. Infant acne. After puberty, the production of androgens in the body increases or the levels of estrogen and androgen become imbalanced. Increased androgen levels can lead to an increase in sebaceous glands and sebum secretion. This in turn causes hyperkeratosis at the opening of the sebaceous glands of the hair follicles, blocking sebum secretion channels and leading to the formation of acne at the mouth of the hair follicles. In summary, acne is a multi-factorial disease. In daily life, we should pay attention to moderate work and rest, eat more fresh vegetables and fruits and vitamin-rich foods, and correct constipation to prevent acne from occurring. Hand squeezing and scratching are prohibited if you have acne.