Hello- Just yesterday I checked on my chickens and noticed my bantam chicken Alvin had a raised lump on left side of her head. I thought maybe the rooster stepped on her by accident as he is much bigger than her. Today the lump is still there and seems "puffyer" and her eyes seem puffy as well. Everything else about her is fine. She is running around the yard and eating and drinking. I'm praying it's not a contagious bacterial infection? I know this is stilly-but could it be a food allergy? She ate cherries for the first time the day before, thats the only thing that was much different.