What is the white fuzzy stuff on my baby sun conure's beak?

That bird does look a little stressed out, but it is also very young looking and as if it doesn't have all its feathers yet. If the baby is acting ill, is always sleepy or listless instead of interested, or isn't eating and drinking, I would be concerned. The baby is also very young looking, and may require additional care and hand-feeding still as it grows. If you are not 100% on getting the bird, or you are concerned with its health and well-being, it is always best to bring this up with the store/seller and ask for any medical or health records. It is always best to get any new pets from a reputable breeder that is willing to share all documentation on the per's care.

Without a photo, it would be hard to say what is going on. If he seems bothered by the area, it suddenly changes in size, color, or consistency, oozes debris, or other symptoms of illness appear, then having it looked at by a vet in person is best.

The photo is incredibly blurry so it's hard to see if there is crusting or any new feathers coming in. Feather loss around the eyes may be molting related if he is molting elsewhere, however eye issues, infections, mites, etc may also cause scaling around the eyes or feather loss. If you can't see new feathers coming in, the eye is itchy or bothersome, or it worsens, seeking veterinary care in person is best.

It's possible there is a yeast or another infection still ongoing, especially if her beak and cere are so flaky and there is buildup. Having your vet take another look and taking a sample to send off for testing or getting started on an anti-fungal may help resolve the problem. Making sure Little Blue is eating a healthy, balanced diet can also help ensure she's getting the right nutrition to help maintain a healthy body and combat any illness.

Some infections such as fungal infections can cause flaky growths around the beak or nose. Growths on the skin from infection, tumors, parasites, etc may also cause a dirty growth appearance anywhere on the body. Regurgitation of food may also cause stuck debris, as well as problems with the crop causing food or bacterial to come back up into the mouth. If it's impeding Chico, can't be cleaned away (or returns even with cleaning) or you are seeing other signs of illness such as changes in energy levels, behavioral habits, eating and drinking habits, etc, then having a vet look at it in person is best. They may need to flush the area and clean it and start Chico on a round of medication to treat as needed.

If you're seeing white lesions in his mouth or on the inside of his beak it could indicate an issue such as a bacterial or yeast infection that has taken hold. If you're seeing streaking on the outside of the beak, it could indicate a cracked beak from an injury or even poor nutrition/underlying illnesses. If it's impeding his ability to eat or the lesions are on the inside of his beak/mouth it is best to seek veterinary care to try and find the underlying cause and get treatment. Making sure Kiko is on a diet that is formulated for parrots can also ensure he's getting the right nutrients. You can offer fruits and vegetables as extras, but a balanced diet is needed for optimal health.

Based on the symptoms you are describing I would be concerned that the bird is either not getting enough nutrition or that he has aspirated some of the food and now is developing pneumonia. My best recommendation for you is to have your bird examined by an avian veterinarian. If your bird did aspirate he will need some antibiotics to help with the infection. Your bird may also need supplemental oxygen while the infection is getting under control. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.