Acne is a common chronic inflammatory disease of the sebaceous glands of the hair follicles. Its causes include abnormal androgen levels, blockage of hair follicles, and Propionibacterium acnes infection. 1. Abnormal androgen levels: Increased androgen levels after puberty can cause sebaceous glands to enlarge, sebum secretion to increase, and pores to become clogged with oil and dead skin cells, thus triggering the appearance of acne. 2. Blockage of follicular opening: When the keratinization of facial skin cells is abnormal, the follicular opening can be narrowed, narrowed and blocked, which prevents sebum from being excreted effectively and accumulates in the follicular opening, thus forming acne. 3. Propionibacterium acnes infection: Propionibacterium acnes usually exists in hair follicles and sebaceous glands, and as teenagers mature, the sebaceous glands’ secretion function increases, and Propionibacterium acnes can easily grow and multiply, thus triggering the appearance of acne. Acne can also be aggravated and triggered by heredity, changes in hormone levels before and after menstruation and pregnancy, as well as by taking certain corticosteroid medications, consuming stimulating foods, or using skin care products that contain stimulants. Once acne appears, you can go to the hospital in time and use appropriate methods of intervention and treatment under the guidance of the doctor, so as to avoid aggravation of acne, which will affect the patient’s psychological and physical health.