Bumblefoot or....?

[gemd]

No one else has it and it was never black or red or pussy or anything; my son noticed she was "missing her fingernail" a month ago. It hasnt gotten any worse.

 

[Colesrogers]

Some of our chickens have lost their toenails. It has happened when they were a few weeks old and seemed to be an issue at hatching. They all are just fine now