Help, What is wrong with my chicken?

[Annefannie]

I noticed one of my hens has a swollen face with white and brown all over its head and on the back of her head under her feathers. None of the other chickens have this. She eats fine and doesn't act sick. Does anyone know what this is and how I can treat it?

 

[Jesusfreak101]

Kinda looks like a fungle infection of some kind