Limping duck with white on ankle and bumble foot

[hayleyasaurus]

Hi, I was wondering if anyone knows what’s going on with my duck holly. When I let her out of the pen today she was limping. Unfortunately she trips and hurts her ankle semi regularly so I wasn’t too concerned as it usually gets better in a couple of days. Then I noticed she had strange white markings on her ankle. The blue color is from ointment I applied to her bumble foot. I didn’t find anything from googling and was wondering if anyone knows what this is. She’s going to the vet tomorrow as she also has chronic bumble foot that is very minor but persistent. Let me know what you think.
Thank you!

 

[Percipen]

Was the vet able to tell what the white is?

 

[hayleyasaurus]

She thinks it was just something like oyster shell that she somehow got on her legs because she was actually able to just flake it off. Her limping is a lot better today so I think it was just a sprain. So now I just have to continue treating her bumblefoot.