History...one of my 3 birds (not pictured) was pasted up and leghargic and getting pecked at. I separated her from the flock for 3-4 days and she's now recovered and reintroduced to the flock. Now all birds have these kinds of sores. At first, I thought they were wounds from the pecking, but now I doubt it, both because of the location of the sores and because they seem to have stopped pecking at each other. Any ideas what we're looking at here?