What is this? Foot infection?

[totalchickenlady]

I noticed this on a few of my 4 weeks old chicks. I really don’t think it is bumblefoot and don’t know how to fix it.

 

[totalchickenlady]

This is the bottom of their feet so I don’t think it’s bumblefoot.

 

[Eggcessive]

Has it been freezing cold weather there recently? Are they kept indoors inside a brooder? Is the bedding damp?

 

[MysteryChicken]

Looks almost like burns.