I have had my chicken for about 3 weeks. When I brought (5) of them home I was told they were 12-13 weeks old. I have one that is a Golden sex link and she now has this bump on her head that is the size of her head I asked the people at the feed store if they knew what it was, but they did not know. She doesn't seam to be bothered by it, I would just like to get a heads up if there is anything I can do to help her???