Acne refers to the growth of acne. Repeated skin acne may be related to endocrine factors, daily cleaning is not in place, dietary factors and so on. 1. Endocrine factors: After puberty, due to the increased secretion level of androgens, the sebaceous glands are stimulated to secrete more, causing the hair follicles to be more easily blocked to form acne. Therefore, endocrine factors in the androgen is the key factor in the development of acne. 2. Cleaning is not in place: repeated acne may also be related to the facial skin cleaning is not in place, grease dirt or cosmetic residues and other clogged pores are also easy to induce repeated episodes of acne. 3. Dietary factors: eating spicy, greasy, high-fat, high-calorie food for a long time can easily lead to the occurrence of acne. Repeated skin acne, it is recommended to go to a regular hospital for examination and treatment to avoid serious consequences.