I thought my chickens were molting (two) in a flock of four, but one hasn't grown back her feathers in a very long time. Today, when I picked her up for the first time in a long while to more closely examine her, I realized she has a huge puffy swelling on her entire chest. It felt like poking something made of jelly rather than solid flesh. It's quite large and very pink. She also has feather loss around her bottom. The other chicken grew back its feathers mostly but also doesn't have feathers on her bottom. Both are still laying. What to do? It seems quite serious. She is thin with this large growth but she used to be a really solid big girl! Help!