Girls with recurring chin acne are usually considered to have acne, the pathogenesis of which has not been fully elucidated, and is related to exuberant secretion of androgens in the body, propagation of Propionibacterium folliculorum, lifestyle habits, genetic factors, etc. The pathogenesis of acne has not been fully elucidated. 1. Excessive secretion of androgens in the body: Excessive secretion of androgens in the body, or imbalance of estrogen androgen levels, will cause sebaceous glands to increase secretion, which will easily trigger acne. 2. Propionibacterium folliculare reproduction: Propionibacterium folliculare reproduction will cause local inflammatory reaction, which will stimulate the hair follicles to cause hyperkeratosis and acne. 3. Lifestyle habits: staying up too late, taking too sweet or too greasy food, mental stress, psychological burden, etc. 4. Genetic factors: some patients are also affected by genetic factors, causing acne. There may be other reasons for girls to have recurring acne on the chin, so it is recommended to go to the hospital for timely examination and treatment as prescribed by the doctor.