One week old chicks with infected feet?

[Jemimapuddlechick]

Hi, I have been reading everything I can trying to find out what this is. Several of our new chicks are showing what looks like infected pads under their toenails? All I can find is bumblefoot and it's definitely not that. Under the toenails it is swollen and red and seems somewhat infected as sand or bedding sticks to them. I just can't find out if it's a symptom of a disease or if it's localized to just the feet, and I don't know if it's bacterial or fungal.
For now we have them in dry grass, will put them in a completely new box. We had kept their box clean with frequent changes of bedding. Not sure what we did wrong.
If anyone recognizes this, I'd appreciate information. Thank you!

 

[Eggcessive]

Pictures of what you are seeing? What has the temperature been, and we’re they shipped to you? Could they have suffered frostbite while in shipping?