Separation is not needed... but I would do everyone's legs if you have the time or energy. The ones you are seeing are just the first ones to show symptoms... as they all have individual immunity, foraging and dust bathing habits. The other may fight it off well enough and not need treatment. Your call. In studies... 90% of the parasites lived on only 10% of the chickens even among the same flock.
Yes... absolutely chickens get dry skin. And that INCLUDES the scales on their legs can actually look pretty peeling and still just be replaced by a perfectly healthy scale underneath. This should be relative to age though and more likely in much older birds... like a couple years old. And when it happens.. the old scales peel right off like they were ready.
When I took one of my chooks to the vet to check for SLM... he said there would be some keratin growth.. looking kinda like finger nails growing... While I can't see that, I do agree with others that yours might be in the early stages.. and I would treat.
I am curious though... them are some pretty white legs for a leghorn. I thought they should be more yellow.
Good looking out.
