Hi I have been raising two little ducklings for a almost a month now and a few days ago I have decided to let them out in the garden for less than an hour so they can have fun and walk around. After a while watching them I have noticed that one of the ducklings isn’t walking anymore so I decided to take them back into the house and he was very exhausted and couldn’t walk at all so I thought nothing about it and just told myself that he is exhausted but the next day it appeared that he hurt his feet somehow and for the last few days I have been treating him to my best abilities and his condition has improved massively and he is beginning to walk a bit again but I just noticed this newly appeared bubble filled with yellow liquid between his feet’s and I don’t know what it can be and researching didn’t help me. My initial thought was to disinfect it and burst the bubbles so the leg gets relieved and the liquid can get out but i don’t know what to do and there isn’t any vets near us like at all. She doesn’t react when I lightly press on it. I am going to attach a picture below thanks!