Itchy acne on the chest may be caused by acne, folliculitis and other diseases. 1. Acne: the cause may be related to heredity, sebum secretion, propionibacterium acnes proliferation and other factors, resulting in pimples, pustules and other symptoms on the face, chest and back, which may be accompanied by itching and pain. 2. Folliculitis: the cause of the disease is mainly related to the infection of pathogenic bacteria, such as Staphylococcus aureus, Malassezia, etc. Local trauma, hair plucking and other factors may also induce the disease. The main manifestation is a red papule centered on the hair follicle, which may be accompanied by itching and can be seen on the head and face, neck, trunk and other parts of the body. There are more reasons for chest acne itching, it is recommended to go to the regular hospital for examination to clarify the cause of the disease.