Be very careful trimming nails. The quick is much closer to the tip in chickens than with dogs and cats. Have some quick stop at the ready.
I've found that it is better to start with just a mild trim and do several treatments over time. The crooked toes may have contributed to the overgrowth since when scratching the soil, they weren't worn down because they didn't make contact with the soil.
Do you have other chickens?
If so, make sure you quarantine.
I've found that it is better to start with just a mild trim and do several treatments over time. The crooked toes may have contributed to the overgrowth since when scratching the soil, they weren't worn down because they didn't make contact with the soil.
Do you have other chickens?
If so, make sure you quarantine.

Some type of oil, work that under the scales really well. Re-apply every few days. The oil will smother the mites and heal the scales. Eventually you may see the old scales fall off to reveal new smooth scales.