Chickens face smells really bad, never normally this bad.

[ILoveMySilkies1]

I've got this silkie chicken that I've had for almost 5 years now, I've recently noticed(while picking her up) that her face absolutely stinks, at first I thought that maybe she needed a bath, but the rest of her body smells fine, its just her head, as I said I've had her for almost five years and she has never smelt this bad, she has never really smelt bad to be honest.
I'm not sure if she just needs a bath or if she needs a vet trip - can someone advise what it might be please.
Thanks

 

[My Three Chicks]

Is the smell coming from her mouth? If so it could be sour crop you're smelling. You'll need to check her crop 1st thing in the morning to ne sire its completely empty and flat before she eats or drinks to rule out a crop issue.

 

[dawg53]

Welcome to BYC.
Have you noticed any of these symptoms along with the foul odor?
Head shaking, runny nostrils, watery eyes, wheezing, sneezing? These are symptoms of Coryza.