I have a hen who was panting and i noticed a small, round yellow spot in her beak on one side next to her tounge with teeny raised spot in the middle. I think it is canker. It can be caused by pigeons which i have, two living in my barn that often visit my coop for feed. Any ideas for getting them to move? Canker is a bunch of yellow or white sores that move down the throat and eventually suffocate the chicken. I am really concerned. I read that the bacteria will be killed by even mildly acidic things, like vinegar which i will be mixing in their water tomorrow. I am also going to use a q-tip to swab vinegar on it. i am going to mix acidified copper sulfate to their water three days a month to prevent further infection. This is one of my favorite hens, i don't want to lose her. does anyone know any other cures? Has anyone had an issue with this and had the hen survive? I caught it very early. My chicken health book says that the sores begin at the back of the mouth but this is closer to the front. So here's what i need: more cures, anyone to tell me if they have had a hen with this that survived, if the fact that i caught it early will help. I'm really really worried. Please help me.