I hope it was just something stuck and it's moved along. I love my girls to death but sometimes they drive me crazy with odd things like this.
Fingers crossed!
I had never heard of air sac mites before so I googled it and looked at my two favorite books regarding chicken health and diseases. From what I could gather air sac mites infect exotic birds. Google gave me that information. My chicken health books did not mention them.
If I am wrong...