This weird lump recently came up on my chickens front leg. I don't know the chickens breed or age and it doesn't seem to be hurting her at all. She weighs roughly 4 pounds and her egg production and eating habits haven't changed. I just noticed it and haven't administered any treatments. It has not spread to any of my other chickens. If possible I want to treat completely by myself. I use hay for all bedding. Attached us a picture of lump.