That def looks like bumble there ouch best way I have tried is soaking in warm Epsom salt water till scab is soft enough to remove with out pulling healthy skin off with it. Then once scab is off you’ll need to get the core infection out sometimes it will come out with the scab other times you’ll have to dig it out. I use a pair of sterile tweezers plus in water fowl is thick and cheesy so it doesn’t pour out like in other animals and humans. Once the infection is out then you fill the hole with some type of antibiotic ointment and put non stick gauze and wrap in vet wrap. Making sure not to wrap to tight. You’ll have to check every 2-3 days to make sure you got all infection and that the wounds is clean. Leave it wrapped till hole is healed.