I just got new White Crested Black Polish chicks from the feed store yesterday evening. I noticed when I got them that they had a lump about the size of a nickel on their necks. I went back and asked if it was normal and all of the chicks had it. Today the lump is about the same on one chick but the other has grown and is now bigger than a large grape. That chick seems a bit more lethargic. Is this normal and if not what do I do?