The causes of chin acne in girls are folliculitis, acne and other causes. 1. Folliculitis: most folliculitis is mainly due to bacteria, fungi and other pathogens caused by hair follicle infections, when the skin is damaged or due to hair and other stimulation of the hair follicle, the skin barrier is damaged, resulting in easy invasion of bacteria into the skin, resulting in the occurrence of follicular inflammatory lesions, acne. 2. Acne: mainly caused by excessive secretion and poor excretion of sebaceous glands. There are many factors that affect sebaceous gland secretion and excretion, including endocrine problems and bad lifestyle patterns such as staying up late, excessive stress and anxiety, as well as eating a sweet, oily or excessive intake of high-protein, high-fat diet. Girls chin acne may also be seen in perioral dermatitis, mask friction and other causes, if the symptoms of girls chin acne, persistent unrelieved, need to seek medical treatment.