Yesterday we noticed that one of our 2 year old hens has a large tumor/growth/abscess on the side of her face. It's pretty firm, appears to be scabbed, and she didn't like me touching it. She has no other symptoms (no runny nose, eye discharge, and she's still eating and drinking). And advice on whether I should treat or just cull? I will not be going to a vet or spending Lots of money. I need to treat this myself or she's getting culled.