If its the same thing that was on my chick, Our chick is doing fine. His wing is still kind of a concern because he holds it kind of different but, he can fly and he doesn't act like it hurts when i cuddle him.
This was a chick that pipped and then started getting weaker instead of stronger, after opening up hatch-brother that died in shell , I helped this little guy out, He wouldn't have made it at all
his cord was wrapped around the top of his head, and wound his wing, His beak when I opened him up was 1/4th inch away from the shell, and he bled a bit I thought he was a gonner, I used my blow dryer on his bottom to help dry up the bleeding, I had to cut the cord to get him out of the egg. I wouldn't recommend this to anyone, it was a Hail Mary in hopes of getting this one out alive.
but, he is doing fine, he didnt have a bubble with different looking feathers, but defiantly was originally misinformed, which he grew out of.
I wish you the best with your chicky chick, and sorry about the others.