Single large blister on chooks face

[Josie_G]

This morning I noticed an enormous white blister on one of my chooks face. Pretty sure it wasnt there yesterday. Doesnt look like fowlpox to me (or maybe thats wishful thinking??) , any thoughts on what it may be?
Thank you.

 

[ValerieJ]

Hi! Welcome to BYC! Is it soft or hard?

 

[Josie_G]

Hi! Welcome to BYC! Is it soft or hard?

Thank you. Do you know, i didnt think to poke it and find out - didn't want to hurt her / risk infecting it / bursting it.