Blisters and possible bumblefoot on duck

[Beth42]

Hi - one of my ducks started limping yesterday and inspected foot and nothing. This morning he has what looks like blisters on his webbing and possibly bumblefoot.
Have soaked in Epsom salts and sprayed with vetricyn. Haven’t been able to wrap it as my other half is away with work and can’t manage one handed! He is on soft bedding and separated from the gang.
Haven’t dealt with this before. Are the blisters part of bumblefoot?
Any help appreciated. I have attached some photos - the best I could get one handed!

 

[DotToDot]

Normally bumblefoot is swollen, and has one black scab. This looks like another foot infection.