Looking for help determining what some of our chickens have/going through? This started to appear in March. We treated for mites with DE on birds and another spray to the coop and run. It has not gotten worse, but not better either and as fall and winter approaches, we are concerned about the cold. Trying to determine what is happening. They are still laying eggs steadily, eat well, act normal. Molting? Illness? Nutritional deficiency? Help?