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I'm just starting out with quail so can't really help, but maybe describe it too as it's not overly clear from pics - to me it looks like it's larger than the other one with some sort of crusty stuff in it? How long has he had it? Did it look like this one morning or did it get progressively worse? These things might help someome else give you an answer x
Do you have a vet you could see? I'm guessing he's otherwise well and happy?