I have not seen scaly leg mites do that...but my experience was with a flock that had it so bad the toes were dying off....it surely would not hurt to dip them in oil just in case...This is what they looked like. 
I think I'm seeing evidence of leg mites on two more hens. They're not swollen at all but some of their leg scales are raised and/or damaged. Can someone confirm from these pics that this is what I'm dealing with?