White "warts" can indeed be clumps of mite gunk. When a chicken has tons of Northern Fowl Mites, these clumps can get built up. Northern fowl mites can go unnoticed on your chickens quite easily. These white "warts" can be a helpful alert!
On the other hand, red Chicken Mites are bigger & easier to spot, plus they leave more gunk around the vent.
One of my roosters unfortunately got so many Northern Fowl mites he got anemic & died before I realized the problem.
Here are photos of what one of my Ameraucana roosters looked like with Northern Fowl mites. He looked pretty different from your birds, it seems, but maybe??


On the other hand, red Chicken Mites are bigger & easier to spot, plus they leave more gunk around the vent.
One of my roosters unfortunately got so many Northern Fowl mites he got anemic & died before I realized the problem.
Here are photos of what one of my Ameraucana roosters looked like with Northern Fowl mites. He looked pretty different from your birds, it seems, but maybe??
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