one of my little Cuckoo Marans is doing poorly. I noticed her vent area was very pink and swollen--took her out and washed her hiney; there was some feces on her feathers under the vent but it was not pasted shut. But it protrudes and looks swollen. I put her back in for a minute and watched her and another chick pecked her on the vent area. So she's in the hospital box and not very happy about it. What is this, and what can I do about it? None of the other chicks seem to have a problem. We've had to clean off their rears twice==but fewer of them had the problem the second week. She also seems smaller than many of the others (it's a straight run so we don't know which are roosters just yet, but she is smaller even than the other small supposed hens).