My new baby chick (shes about 3-7 days old) has developed this big lump to the side of her neck and is plucking her feather out on it. She had it when I got her 3 days ago but now its getting bigger - almost the same size as her head! Its off to one side and I cant seem to move it around and its pretty hard so I'm a bit unsure if its her crop or not? I must admit I was a bad mumma and was giving her sesame seeds and letting her eat whatever she found in the backyard when i was doing introductions to my other hens on her first day and im worried she hasnt digested it all properly. I've got her on a strict water and chick crumble diet, now that i realised my mistake. Just hope my ignorance wont cause her any harm Help??