Duck bumblefoot questions

[Chickducklover]

My duck has bumblefoot it's foot has been swollen for days but just got a black scab yesterday after reading and watching numerous articles and videos we soaked its foot and removed the scab but no matter how much we squeezed or cut there was nothing but raw skin underneath so we put ointment on it and wrapped it. Did I miss something or is there a possibility that it didn't have a lot of infection in it yet? Should I just clean it and wrap it every couple of days?