Please help. One of my chickens (1-1/2 yr old) has a horrible looking rear end. The opening is bloody, swollen and white goo is coming out all over her feathers and drying and sticking there. She is still laying but I'm sure it hurts. There is blood on the egg she lays. She seems to be acting normal - still eating and drinking. Does anyone know what this may be or how I should treat it. Looks painful, want to help her.