My EE (Hermione) has white spots on her comb that look like little seeds. I thought it might be lice (lots of wild birds around), but whatever it is is really stuck down. My fingernail couldn't dislodge one of them. There are no signs of parasites around her vent or under her wings. Anybody have any ideas? They have DE in their shavings, but otherwise have not been medicated for anything.