I have an approx 2 y/o maybe older Mille Fleur. He is healthy, acting and eating fine but I noticed that his cone is turning black as well as a portion of his head/face where the cone meets. I noticed a few weeks ago that it was a pale pinkish and thought it was because of his age. Is this something that happens with age? This is my first run with chickens and this roo was given to me by my friend so I have no idea what to expect. Thanks!