One of my hens hasn't faired well from being mounted by our rooster. She's been fighting to keep feathers on her saddle and over the last couple days she's developed a large lump in the center between her wings on her back and this eve I notices the top of her wings (closest) to her back are looking swollen. I'm sure this has something to do with infection from all the injury to her back, but what do I treat her with? I tried seeing if I can open up the large swollen area, but didn't seem to have much fluid? Anyone ever run across this before?