I have a 3 week old welsummer in a brooder with one other chick (salmon faverolle). Yesterday I noticed a bald spot on the back of her neck...it is not a bleeding wound yet, but it did look red and a bit irritated. I have been trying to watch and make sure it was not the roommate plucking her, and I don't think it is. She seems to scratch a lot. I have a total of 7 chicks in this room, in 3 different brooders, and no one else seems to be itchy. I looked at her vent, it looks normal...no bugs that I can see, but these are my first chicks so I am not 100% on what I am looking for. Any suggestions on what I can do?