Help, swollen around the beak!

[Lady Gray]

I have a chicken that I noticed some swelling around its mouth and it progressively got worse so I treated it with 4 in 1. It’s been eight days and I don’t think it looks any better.

there is no foul smell coming from the mouth and I can’t find any pustules or deposits. Any insight would be greatly appreciate it.

 

[Wyorp Rock]

Can you get some photos of the inside of her beak?