What is wrong with this bird?

Hi All

We have a bird which comes to the feeder and it has something wrong with its face.I am not sure if I am allowed to put a photo of it on this website so people can see it and tell me what is wrong.

It looks like  a growth or sore which covers one eye.

If I am allowed to post a photo I will.So if someone will say if its OK because I dont want to offend.

Thanks

Jane