I have a 7 week old olive egger, she's a lovely lavender grey color but she has come up with red blotches on her wing-feathers and the back of her head. The feathers look completely healthy, the red doesn't wash off, she's acting normal, and the skin is not irritated. I'm fairly sure it isn't mites(but will be treating everyone just in case) but it's so strange to me. Is there anything that could cause this?