By 12-Week Old Polish's head is bloody and raw. The 8 other 12-week old chickens that are in the coop with him/her have been plucking it's feathers and have gotten it's head bloody. The area looks a little swollen, but I don't see any skin missing...just missing feathers. How should I treat this? I have separated him/her from the other chickens. I am worried about washing his/her head because I don't want to cause any brain damage by possibly pressing on his/her brain. Here is a picture of what it looks like.