One of the new chicks I bought today has a funny looking rear end. There is a pea size bump just above the vent and when it poops it chirps really loudly like it hurts. The poop is very solid and rock hard. What can I do to help it? Is there anything I can do to make the bump go away? I forgot to mention that around its butt the feathers are missing. EDIT: Here are the pics of the problem area. This morning I had to clean off his butt b/c it had crusted up during the night. I also put vasiline on the area and thats why it's shiny. And here is a pic of the whole chick.