Need a diagnosis - Possibly blackhead?

he is general info:
I bought the 2 day-old chicks from McMurray, they arrived on 7/17. None have been sick other than a little pasty butt week 1. They were on McMurray electrolytes from day 1 until they were about 10 weeks old. I have been ACV since. I live in Southwest Florida near the Everglades, west of Fort Lauderdale. It's still in the low 90 to upper 80 daytime and upper 60s to low 70s at night. They still pant during the day on the hotter days. Their coup is 8x8 by 4 feet high and on wheels and 4 ft off the ground. The sides and bother are ½ inch hardware cloth. it has a 8x16 foot print with the shade wings open. I wash the coop every other week with dawn soap and water. They have in the coup since week six. They spend a lot of time under the coop during the day to keep from the sun and aerial predators. They are out in a run that is 50x50 sun up to sun down. I started them on mcmurray starter. Moved them up to McMurry grower until the bugs came out of the feed, then tossed the balance in my pond to the fish. Used purina organic grower for about 4 weeks until I could get to Tractor Supply. For about the last 4 weeks, I feed them TSC Organic starter/grower, they get bananas and fresh vegetables every couple of days, and lots of grass and bugs daily from the run. They get about 4 cups of scratch about once a week. The most affected birds are the black Australorps, but is seems to be affecting the Blackstart sex-links, Gold Laced Wyandottes, the silver laces are look like its just beginning as their bills are turning black. The Red start sex links are unaffected, also the dominiques, brown leghorns, cochin, and ameraucanas remain ok. I just check poop in below their night perches all looks normal. No yellow watery like I saw in some pictures. Many of the birds that should have yellow bills have blackening bills. I wash the A friend mentioned that the heat may be affecting them. Not sure about that, this issue started in the last week.
 
Looks like the color pigment of the comb, face and wattles. This one is darker but you can get the idea.
I’m not a photographer lol
7FCC85C3-3347-47CB-8A31-AD1DD4992893.jpeg
 
They pant due to our heat.
Blackstart sex-links, Gold Laced Wyandottes, the silver laces are look like its just beginning as their bills are turning black. The Red start sex links are unaffected, also the dominiques, brown leghorns, cochin, and ameraucanas remain ok.

Knowing your location helps:)

Again, what symptoms do you see that makes you think Blackhead?

Full body shots can help too, so we can see the legs and body, but to me that I don't see a Black Australorp or Golden Laced Wyandotte in your photos. Since you mention Sex-Links, that's probably what they are. (Wyandottes should have a Rose Comb, not a straight comb)
Each hatchery creates their own Sex-Links, so the comb/wattle/leg and a beak colors can vary. I think the coloring you are seeing is just the way they are. Genetics.
 
My guess is they could be rubbing on the hardware cloth fencing in your chicken tractor, but dirt could also be a possibility. Fungus usually looks like white powder, so I doubt that it would be a fungal infection. As long as they are acting fine, I wouldn’t worry.
 
Just looking back in the pics, the beak in the one hen has a tortoiseshell look, which is probably just breed-related. I have seen a few pics of a black sex link that has a black face. With hatchery chickens, there can always be a lot of differences that the breed standard.
 
So I stopped by a local vet that also sees barnyard and large animals. Since all signs were normal except pigment he said they may be getting into particular plant or there is something in their environment that may be creating a photosensitivity which could be creating the pigment change. He could not give a definitive answer but did say if they show any new symptoms of illness I would one over for him to examine as soon as possible.

The mystery continues. If anything changes, I will post.
 
No frostbite here, we are still in the low 90s.
It's not blackhead, I guarantee it. :D :hugs I agree with @roosterhavoc, it looks like it's just the coloration of their comb and wattles. I have a bunch here like that and I'll get some pictures so you can see that it's normal. Like you, I wondered about it the first time I saw one.
 
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