That is an awesome thread. I've never had thrush but it was very informative and interesting.
I too have used Vetercyin for wounds and wow...good stuff. It is basically a heavy amount of sea salt. Basically what the dentists say to use to kill bacteria in the mouth after a heavy cleaning, to...
Hopefully someone can respond that has more knowledge in this than I.
I've never had it so I am not much help other than directing you to forums or literature that might help.
If I were you, I'd go to the top the screen here, in the search box and type in key words such as canker soars in mouth...
Look at this photo, link below, and then check your chicken for the same.
https://www.backyardchickens.com/t/811335/my-hen-has-a-lump-in-her-throat
Make sure you read the link within this forum provided by Naunnie
https://www.backyardchickens.com/a/trichomonas
Treatment:
"Metronidazole to kill...