We've had our four hens for just over a month. All was going fine until two days ago, when my husband noticed that one of our chickens had something on its face. See the below picture. She's eating normally, laying normally, acting normally. I read through our chicken book and did some searching online, and no disease or infection seems to match exactly. My best guess at the moment is dry fowl pox, but I thought I would consult the wisdom of this community. Any thoughts are appreciated.