This morning I noticed that the smallest of my chickens, probably around 16 to 20 weeks old, had a bloody spot near her tail and that the others in my mixed flock were very curious about it. She has not started laying yet. Only 2 in this group of 8 have; they are a few weeks older than this one. We got her out and put her in a separate dog crate to keep them from picking at her. She seems ok mostly, a little upset at being moved but she's eating and does not seem to be in any distress. I looked and could not find the source of the blood. It is at the top of her rump where the tail feather stick up. I smeared the whole area with neosporin. How long should I keep her separated. She had not been the obvious bottom of the pecking order before this, in fact seemed to be smarter than the bigger ones.