I have a chicken that is 19 weeks old. Is acting week (I noticed this since all have roosted religiously since 6 weeks of age but she started to try to sleep in a laying box the last couple of nights- she is too weak to fly up), so I did some inspection. She has a sore/ scab just under and on her vent. She still can poop... but is squeezes out above the sore area and is creamy looking. What does this sound like? What to do.