My parakeet has a fungus or something growing on his beak and around his eyes. It seems to be spreading.
Several things can cause proliferative lesions on pet parakeets.
But in my experience the most common cause of such lesions on the face are Knemidokoptes mites, commonly called scaley face or leg mites. A microscopic exam of scrapings from the affected region will usually determine if either of these mites have caused your parakeet's condition. If left untended, these easily treatable conditions can cause permanent deformities in the affected tissues, or even death. For example, the beak can become so misshapen over time that your parakeet will not be able to eat. See your veterinarian as soon as possible.