my rooster is about 10-11 months old standard Cochin He is eating, drinking, and behaving normally. His head started swelling about 2 weeks ago. I thought at first another chicken had hurt him or something but the swelling has not went down. All of my other chickens are fine and not showing any signs of anything. i did notice his nostril bleeding two times since this started. his poop has been normal. He has been on tetracycline in his water for the last week and it doesn't seem like it has helped. does anyone have any idea what is going on with him and what I can do?