We have a veterinarian here, don't we? My cat is old and we are broke. I know I probably need to take her to the doctor, but her inner nostril is swollen and has been for quite a while. Mostly her left nostril and there is noticibly green mucus inside the lining. In your opinion, veterinarians, what could have caused this? A virus, allergy? Im at a loss!

heres a picture, I can't tell on my phone how large or small it is. My apologies!

ANY insight is appreciated.