There is a large black spot covering the back of one of my largest toms head. When I first saw this, I was so afraid it was "blackhead". My turkeys have never been close to chickens, the closest the chickens to my turkeys are more than 1,000 feet away locked in a pen. This bird does not have the symptoms of blackhead either, because he is eating well and is very strong. There are no sulfur looking stools in their yard either. So, if this is not blackhead, what is it? It suddenly appeared a couple days ago, the rest of my turkeys are not show anything like this. Is it an injury? Except for my 3 hens and 1 tom, I am raising these turkeys for consumption. What should I do? Thank you in advance for help.