Please help me diagnose what’s on the bottom of my chickens foot

[chickynuggy21]

 

[Eggcessive]

That is a bumblefoot scab and that may be a larger one on the toe pad. It can be a bacterial infection. There are many ways to treat it including soaking the feet in warm soapy water for 20-30 minutes to soften the scabs. Sometimes you can pull the scab off, and try to squeeze out the yellow waxy core inside. Sometimes or if you want to skip the soaking, you may have to do bumblefoot surgery to get the infection out. TriCide Neo soaks are a third option. Here is a good link about bumblefoot treatment:
https://the-chicken-chick.com/bumblefoot-causes-treatment-warning/

https://ouroneacrefarm.com/2013/11/09/bumblefoot-treatment-tricideneo/