Hi. We have a chicken that has an extremely large lump on her neck - it nearly touches the ground. The rest of her body is extremely skinny. She has not lost any feathers and seems to be acting normal. We have removed her from our other chickens and put her in a seperate coop. A friend said that we might be over-feeding her. We haven't feed her in about 2 days and she does seem hungry. Her lump has not gotten any smaller. What concerns us most it that she is literally feathers, skin and bones besides where the lump is. Any help or advice would be appreciated. Thanks!