I've looked around on some older posts but can't confirm what I have going on here. I have three pullets about 21 weeks old. The barred rock i noticed a week ago was rubbing/scratching it's head. But other than that everything seemed normal. It seems over night that the left side eye has gone completely white and her head is swollen,twice the size of the other side I didn't notice anything yesterday when i went out to check them. She is definetly on the bottom of the pecking order. Maybe shes been picked on to much. Other than that she's eating, drinking and pooping normally. Ive seperated her from the rest in the coop. The other two seem fine, eating drinking running around ect. I got them all from the same lady that said they were vaccinated for Mareks. maybe it didn't take on her or she wasn't vaccinated at all. I cant afford to go to a vet. and would like to treat her myself, if possible. I would be thankful for any held or advice! Going to post a couple pics too!