5 chronic skin ulcer 2 cultures gram- ancintobacter anaerobic taken PO doxy, Cef, Kef, Clinda, Amox, Cipr no immune diseases, why cant the bacteria die?

See a dermatologist. Begin with a diagnosis. First define why you have skin ulcers. Where? How long? etc. It is NEVER a simple question of which bacteria and which antibiotics. MOST skin ulcers should not be treated with antibiotics at all. I suspect you are being treated by someone who should refer you to a more knowledgable DR.