Acne may be caused by acne, folliculitis, rosacea and other diseases, due to the different causes of the diseases, which may lead to the recurrence of acne, as follows. 1. Acne: The formation of acne is associated with abnormal androgen levels, abnormal oil secretion, abnormal keratinization of keratinocytes at the opening of the hair follicle and local infections, etc. At the same time, heredity, psychological stress, lifestyle and so on can make the condition recurring or aggravated, resulting in repeated acne can not be good. In addition, female acne patients should also exclude polycystic ovary syndrome, which can also lead to repeated acne. 2. Folliculitis: Folliculitis is a kind of purulent skin inflammation limited around the mouth of hair follicles, mostly caused by Staphylococcus aureus infection. If the patient suffers from diabetes, AIDS or long-term use of immunosuppressive drugs, etc., it is easy to lead to bacterial infection, resulting in acne over and over again. 3. Rosacea: Rosacea is also known as rosacea, its formation may be related to genetics, impaired skin barrier function and other factors, local infection of follicular worms, long-term use of glucocorticosteroids and so on will aggravate the disease, so if the patient does not remove these triggering factors, it may also lead to acne over and over again can not be good. When the patient acne back and forth is always bad, it is recommended to go to the regular hospital in time, do not use private medication, should be under the guidance of a professional doctor for symptomatic treatment.