please help. fungus in the mouth? absess maybe?

[lividsorrow]

I found this last night when checking on the chickens. She's got some sort of mouth sores? What is this and how do I fix it? I've never seen this before.

 

[Wyorp Rock]

It could be canker or wet pox.

Metronidazole is most common treatment.

http://www.thepoultrysite.com/diseaseinfo/154/trichomoniasis-canker-frounce/
https://www.backyardchickens.com/t/1080266/canker POST#6, 10, 13
https://www.backyardchickens.com/t/773308/canker-treatment POST #4
https://www.backyardchickens.com/t/1064166/canker-tried-few-treatments-not-getting-better POST#2