Skin acne may be caused by endocrine factors, poor diet, improper cleansing and other reasons. 1. Endocrine factors: Due to the exuberant secretion of androgens in the body and the increased secretion of sebum by the sebaceous glands, the hair follicles may be clogged, resulting in the formation of acne. 2. Poor diet: Eating greasy, sweet food and dairy products may stimulate the sebaceous glands to secrete large amounts of sebum, resulting in acne. 3. Inadequate cleansing: Inadequate cleansing of the skin may cause aging keratin and oil to clog pores and trigger acne. In addition, irregular work and rest, excessive mental stress and the use of oily cosmetics may cause skin acne. If acne is not relieved, it is recommended to visit a hospital for examination and treatment under the guidance of a doctor.