I have a pigeon who has developed Sinus Canker. He's one eye has been shut due to inflammation and yellow color lesion is also seen on his beak. He cannot eat of his own. I am feeding him liquid through dropper. I have seen in one of the website about Sinus Canker and its medicine is Ronidazole. In my locality i could not find the medicine. I am bit worried as to how i can cure him. Please suggest some alternate effective medicine at the earliest .