Is this foul pox or canker? (updated photos)

[silkie_smooth]

Hi! I’m concerned by this white crust/puss on the corners of my Silkie chicken’s beak (2 of 4 chickens have this). It looks like it could be canker or foul pox. The chickens are just as spunky as ever so it doesn’t seem to be bothering them. I just noticed when one opened her mouth. Would love any advice if this looks familiar. Thanks in advance!

 

[Eggcessive]

Can you see any yellow or grayish white material inside the beak?

 

[silkie_smooth]

Can you see any yellow or grayish white material inside the beak?

Thanks for getting back to me! The outside of the beaks look totally healthy. There’s no yellow or grayish white material on the outside. Just the yellowish-ish white material on the inside corners of the mouth. They remind me of canker sores or chapped lips :/