Newly hatched chick with swollen feet?

[Alpine Swift]

He recently hatched (I'd say he's a hour or so old.) and seems active besides the swollen legs and feet. Both feet are swollen, with red sores. He's the first in this batch with this issue. His upper joints are red as well. I can take more photos if needed.

 

[Kiki]

What's on the floor of your incubator?