I was outside locking up my girls for the night and noticed one of my hens feet looked swollen. In the second photo you can see a circular dot that is on the bottom of her foot. Both feet have this same dot. i tried to wipe it off thinking it was dirt but its not. After doing some research I think it may be bumble foot. Can I get a second opinion and also how do I treat this? Do I need a vet or is it something I can treat myself? Thanks!