my 7yr.old hen has what looks a boil on the top of her foot very swollen and pussy looking. after washing them I opened the boil. it drained a cream thick stuff. On closer look at the feet the bottoms have what looks like calluses. After a warm soak they started to come off. I removed them and they looked like pointed tacks but with the same pussy stuff. She now has a hole in the bottom of each foot. What is this? What can I do? I'll try any suggestions. She is the first chicken we ever had and we all love her so much.