Acne can be caused by physiological factors such as a poor lifestyle, or it can be caused by acne, folliculitis and other disease factors. 1. Physiological factors: irregular diet, work and rest, love to eat spicy and stimulating food, often stay up late, lack of sleep, etc., these may cause a short period of time to grow acne symptoms. 2. Acne: is a follicular sebaceous gland unit of chronic inflammatory skin disease, preferred in the cheeks, forehead, followed by the chest, back, etc., which will be manifested in the symptoms of acne. 3. Folliculitis: a group of infectious skin diseases involving hair follicles and their surrounding tissues, occurring in the head, face, neck, buttocks, etc., will also be manifested as a symptom of long acne. There are other causes of acne, and it is recommended to consult a doctor in time to find out the cause of the disease and target treatment after excluding physiological factors.