Acne is often considered to be caused by acne, which may be related to factors such as increased androgen levels, bacterial infections and abnormal keratinization of sebaceous glands. Increased androgen levels: Normally, androgen levels and sebaceous gland secretion are positively correlated. If androgen levels increase, sebaceous gland secretion will also increase, resulting in a large amount of oil secretion and localized acne may appear. Bacterial infections: Common bacterial infections are usually Propionibacterium acnes, which may lead to localized acne if the localized Propionibacterium acnes proliferates excessively. Abnormal keratinization of sebaceous glands: it may lead to blockage and narrowing of the follicular canal orifice, etc. Local sebum may not be able to be discharged, and may be prone to the formation of pimples and acne. There are many causes of acne, and it is recommended that patients consult a doctor for a clear diagnosis and appropriate treatment.