HELLO , I HAD A BAD SORE/RASH ON MY ARM

HELLO , I HAD A BAD SORE/RASH ON MY ARM FOR ABOUT 4 WEEKS , IT WOULD NOT GO AWAY , I WAS USING ALL TYPES OF MEDICATIONS TO TRY TO CLEAR IT UP BUT IT DID NOT GO AWAY , ONE DAY IN THE SHOWER IT WAS SO ITCHIE I SCRATCHED IT AND IT STARTED TO BLEED A LOT AND THERE WAS A HOLE IN MY ARM RIGHT BELOW THE ELBO ON THE INSIDE OF MY ARM , IT CLOSED UP BUT TOOK A LONG TIME , I WENT TO THE MEDIEMERGE CLINIC AND THEY DID A CULTER AND IT CAME BACK RARE EPITHELIAL CELLS SEEN NO ORGANISMS SEEN BACILLUS SPECIESIES ( NOT ANTHRACIS ) 1+2 COLONY TYPES NO ANAEROBES . CAN YOU EXPLAIN WHAT THIS IS ? I WAS TOLD TO GO TO A DERMATOLOGIST ,