You can use raw apple cider vinegar. Apply it wif a cotton wool after you bathe for 15 mins then rinse it off with warm water. Apple cider vinegar kills the bateria.
http://homeremediesblogger.blogspot.sg/2012/07/apple-cider-vinegar-for-acne.html#!/2012/07/apple-cider-vinegar-for-acne.html