Acne on the face refers to common acne in medical terms. The appearance of acne on the face at the age of fifty may be related to factors such as increased androgen levels, keratinization of sebaceous gland ducts, and propagation of Propionibacterium acnes. 1. Increased androgen levels: Increased androgen levels or an imbalance between estrogen and androgen in the body may lead to an increase in sebum secretion, resulting in the appearance of acne on the face. 2. Keratinization of sebaceous gland ducts: If keratinization of sebaceous gland ducts occurs, it will lead to the follicle opening becoming smaller and blocked, so that the sebum secreted cannot be discharged, which may induce the disease. 3. Proliferation of Propionibacterium acnes: Propionibacterium acnes activates keratinocytes and stimulates inflammation around the hair follicles by producing fatty acids, which may trigger the disease if Propionibacterium acnes overpopulates. For patients with acne in their fifties, it is recommended to go to a regular hospital for examination to clarify the cause of the disease.