Suggest Treatment For Infection In Umbilicus

I HAVE AN ONGOING BELLY BUTTON INFECTION SINCE APRIL, SEEMS LIKE THE DOCTORS HAVE TRIED EVERYTHING FROM CERTAIN CREAMS, POWDERS, PEROXIDE, ANTIBIOTICS. HAD A CT SCAN TO RULE OUT ABCESS AND THEN ULTRASOUND AROUND AREA. IT IS SORE AND STARTING TO HAVE LITTLE PUS ON WALL OF NAVEL AND A LITTLE ODOR AND SOMETIMES BLEEDING ON TOP OF SENSITIVE SKIN INSIDE. IT ALSO CAUSES PAIN AT CERTAIN TIMES UNDER THE NAVEL JUST LIKE YOU WERE HAVE A STOMACH ACHE. WHAT ELSE SHOULD WE TRY? HELP, I HAVE HAD THIS SINCE APRIL AND IT GETS BETTER FOR A WHILE AND THEN HERE IT STARTS ALL OVER AGAIN.