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I would start off with Janiedoe's suggestion bearing in mind the fragility of raised scales.Thanks. So no ivermectin needed? Slather Vaseline after treatment? What does debride mean? Just rub? Would you suggest just spraying at first? Clean out the shavings in the coop and spray the coop roosts and corners as well? Anything to do to the run? I’ve quickly looked at the other birds, and don’t see anyone with scales like this.
I'm reluctant to use ivermectin although I have for really stubborn cases. The problem with ivermectin is the mite has to bite/feed to ingest the drug. I much prefer to kill the mites without them feeding any more. It's the biting that irritates the chicken and the raising of the scales. If one can kill the mites without any further bites that's a result in my book.
Of course, if one is trying to treat a lot of chickens then using vasline/oil/spraying or applying permethrin takes a lot of time and gets seriously messy.

What you do need to be aware of is the scales don't lie flat again after treatment. The chicken has to shed the scales and regrow new ones before the leg looks normal again.
Also, it seems that some chickens are much more prone to scaly leg mite than others and should you have a chicken that is prone to this mite then treatment is an ongoing affair, even with ivermectin.