The left bottom part of my cockatoos neck is swollen, Max…

Thank you for waiting. While of course it's possible that Max injured himself, whenever we see swelling in this area, we suspect a problem with the bird's crop (where food passes through on the way to the stomach). However, there are many different types of crop conditions that could be causing this. If there's an infection of the crop, antibiotics would be needed. An impaction may need to be removed surgically. You can try massaging the crop. Sometimes that can get things moving again. To do that, you would have to hold Max with his head down so that he wouldn't aspirate anything that comes up. Some people are comfortable doing this, but I don't personally recommend it because of the risks.

There is also a condition called sour crop that would require medical treatment. A drug called Nystatin is often prescribed. Because there are so many possibilities, you'll really need a vet to diagnose this. There are many home remedies available online, but I can't recommend them because most are ineffective, and some are downright dangerous. Sometimes it helps to withhold all food for 24 hours, but provide plenty of water. Since it would be hard to find a vet today, you may want to try this. This site has directories that will help you find an avian vet:

http://www.avianweb.com/recommendedvets.htm

If you have more questions, just let me know. I'm glad to help. I hope Max will be fine.

Anna

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Here is a site where you can read more about a bird's crop.

https://en.m.wikipedia.org/wiki/Crop_(anatomy)

And on problems:

https://vcahospitals.com/know-your-pet/crop-infections-in-birds