One of our chickens has developed a lump on one side of her chest. She's a bantam cochin frizzle. It's a little hard to see in the picture because of how she is positioned (she's not a very cooperative model), but the right side is significantly larger than the left. It looks almost like a goiter, if chickens have goiters. She used to have a lot more feathers than she does now. In the early spring this year, she started to become more and more scraggly-looking, and the feathers have never grown back. We have 5 other healthy-looking chickens, so we aren't sure if she's just molting (do chickens molt for 7 months?) or if something else is going on.