It does look like a mild bumblefoot. I have seen and treated worse.
What do you see when you look close? Is it open and can you see a yellowish clump?
Often I have has those pop out when I wiggled it back and forth.
Then I wash with soap and water and pack with antibiotic cream, cover with a gauze bandage square and use vet wrap to hold it in place. Try to keep the duck out of mud, water, etc for several days.
You will need to check the foot every day and clean and rebandage.
Oh and wash your hands thoroughly and or use latex gloves. Bumble is a staph infection and you need to use care in handling the feet.
What do you see when you look close? Is it open and can you see a yellowish clump?
Often I have has those pop out when I wiggled it back and forth.
Then I wash with soap and water and pack with antibiotic cream, cover with a gauze bandage square and use vet wrap to hold it in place. Try to keep the duck out of mud, water, etc for several days.
You will need to check the foot every day and clean and rebandage.
Oh and wash your hands thoroughly and or use latex gloves. Bumble is a staph infection and you need to use care in handling the feet.