What to do soak in warm epsom salt water for at least 5 min or longer then dry and use a drawing salve then wrap and give it a day before soaking again and applying the drawing salve. Usually soaking will soften up the scab so you can gently use your fingernail to pull it off once you get there you can take tweezers ( sterile) and pick out the infection duck pus is yellowish and thick not runny. This is not something that can be done in a few days you want to make sure the scab comes up easy so as to not rip healthy skin. Once you get the infection out put some type of antibiotic ointment in the hole wrap again until healed. Keep her out of swimming water while treating. I use a bucket to soak and put both legs in makes it easier to hold onto the duck. You don’t want them drinking the water.