Yesterday I noticed one of my 4 week old Cochin chicks has a scaly hard bump on her shank just above toes , like in front of my ankle. She did not seem to be bothered by it and was walking normally. Today she has a swelling on the other shank as well. I have dusted the whole flock today for mites, but not sure that is what it is. I also put Neosporin and Vaseline on her shanks then dusted her feet again. Any one have any ideas? None of the other 18 chicks have this, though they are all getting rid of their baby fluff and getting feathers.