I have dealt with bumble foot so many times now. I have found you dont have to remove the scab unless its really bad. I soak their feet in epson salt, then spray microcynAH spray on the effected area(peoole onlime recommened this for bumble foot). If the scabs are small that is all I do every other day. If they are bigger, I use the Hen Healer its a blue ointment for chickens and wrap thier feet. I still do this every other day, I found that every day was tedious and stressfull for the chicken. I only had one chicken I had to remove the scabs and drain the puss and remove the core. It was my first case and I had no idea what I was doing, let it go to long.