Hello dear, Thank you for your contact to health care magic. I read and understand your concern. I am Dr Arun Tank answering your concern. Peptostreptococcus is an anaerobic and aerobic bacteria. It can grow in absence and presence of oxygen. It is usually resistant to all the routinely used antibiotics so it has not responded to metronidazole and penicillin. I advice you to take clindamycin now. This drug can act on both the aerobic and anaerobic bacteria simultaneously. It is potent enough to kill the peptostreptococcus. Maintaining good hygiene by frequent cleaning and dressing can help cure the infection early. You can use hydrogen peroxide it will kill the bacterial cell wall and can help in healing. Povidone iodine and polysporin cream can be helpful. Avoid injury to the site. Otherwise it will hinder the healing procedure. I will be happy to answer your further concern on bit.ly/DrArun. Thank you, Dr Arun Tank Infectious diseases specialist, HCM.