Hi, hoping someone can give me some direction. I have 3 RIR that are approx. 18 mos. old. My best layer (her name is Thyme), appears to be going through a severe moult-her first ever. She has lost all of the feathers on her chest, tail, and legs. In itself, I guess that wouldn't be strange (except that neither of the other 2 are doing it). But she has a rather large lump (size of a half dollar) where her breast is. It appears to be right of center. Do you think she has a growth, or is this a normal part of the chicken anatomy? Sorry for the newbie questions. Also, it is getting quite cold up here. Without these feathers, isn't she going to get excessively cold? I put some heat lamps in the coop today just to help out. She is so small. It seems like something is wrong. Any thoughts? Worried Dad...