My 4 month old Bar Rock started to limp about a week or so ago. I checked his foot out and found nothing wrong, I think it was more of a spran. He is now walking fine. Then a few days later I noticed some tiny black spots on his comb. He comb is starting to turn blak. Mister is his name, he not crowing now. Mister's comb has been turning black for about 4 days now. He is not running around as much. Now noticed the same tiny black spots on his comb. I feed natural feed and scrap vegetables and fruits and clean water everyday and most days twice a day.