Acne, generally referred to as acne. acne on the face at the age of 40 may be related to skin infections, endocrine disorders, mental stress, high-fat diets, etc., and need to be clearly diagnosed. Skin infection: Acne onset is related to bacterial infection such as Propionibacterium acnes. And some people with acne will develop pustules, which is related to infection with bacteria such as Staphylococcus aureus. Therefore, if people in their 40s don’t pay attention to keeping their skin clean and hygienic, it may trigger skin infections and lead to acne. Endocrine disorders: acne in 40 year olds may also be due to endocrine disorders, especially in women. Because 40-year-old women may also have polycystic ovary syndrome, etc., resulting in excessive secretion of androgens, which leads to the phenomenon of acne on the face. Mental stress: bad mood, depression, anxiety and other reasons, will affect the body’s endocrine, may also trigger long acne. High-fat diet: frequent, long-term high-fat diet can also trigger acne. If you have too much acne, then you should consult a doctor for examination in time and strictly follow the doctor’s instructions for treatment.