Yesterday I found a very young chick running around in my yard and it was trying to get into the area where my chickens are kept. I have no clue where this chick came from, but since it is getting cold and it is too young to fight off anything, I took it in and put it by itself. I noticed it had a lot of its poop stuck onto its rear feathers and it smelled, so after cleaning it up I found that the chick's vent is very bloody and the tip of it is a green-ish color. I am wondering if there is anything I should worry about with this chick. Today I cleaned the vent area again and it is throbbing and protruding and seems to have a hard time passing poop through. I gave it some corid in case it has coccidia, but I do not know what is causing the throbbing and protruding.