Answer by  
                                                                                          cindy2366 (224)
                                                            
                          
                          
                                                          Back acne usually occurs during puberty, when sebum is produced through the sebaceous glands. When there is an excess of sebum; pores and hair follicles will become clogged which attracts bacteria and causes acne. This can be helped by treating it with a 10 percent benzoyl peroxide cream or gel.If it is severe one should go to a dermatologist.