I noticed one of my chickens limping this evening. I picked her up to check out her feet. I noticed what looked like a clump of dirt stuck to the bottom of one of her feet. Then I checked her other foot; it has a dirt colored circlle in the middle of the bottom of her foot; the pad of the foot appears swollen. I tried soaking her feet in water, but it did not help. My daughter thinks they look like warts. The chicken is a little over a year old easter egger. She is laying consistently and eats Flock Raiser as well as treats and free ranging in the evenings. She is limping quite extremely. What can I do for her? Any ideas of what it could be? Thanks for your help.