Here's one more link for you. Sorry I haven't been able to pin point this for you. It might be worth logging onto featherfanciers.com and asking Dr. Brown under the ask the doc section. He's a poultry specialist and I am quite certain he'll know what it is and how to treat it if it's treatable.
http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/202800.htm&word=parasites,in,poultry
http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/202800.htm&word=parasites,in,poultry