I need some help. My 6 ducklings from Metzer are losing down on their necks and backs. They are about 2 weeks old and one has a visible puffy spot on her neck that looks really irritated. What could be causing it? Could it be bedding? Vitamin deficiency? I use old bed sheets as the bedding right now, could it be the dye in them irritating them? I feed an all flock feed as well, could that be it? I really dont want it to be something serious, I would hate to lose them. Anything I can do to help? I can post pictures if that would help any.