Bubble thing on neck/back

[moonpearl]

I'm so sorry. I hope my little guy does ok.

 

[cldominguez97]

I have a similar situation and if someone can please tell me what is wrong that will help me a lot because I'm scared that it's not an air bubble and it's her crop.

 

[cldominguez97]

Here are more pictures

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[cldominguez97]

Click on the image to see it better

 

[Eggcessive]

It could be a leaking air sac (subcutaneous emphysema or wind puff) that can occur with an injury to the neck or chest. If there is no respiratory distress, I would just watch it, but if it seems to make her breathing difficult, you can use a 22 gauge needle to punture it and squeeze the air out. Then hold a finger on the punture for about 5 minutes to try to seal off the needle sight. This can happen again after removing air, so watch it.Here is some reading about this:
https://www.backyardchickens.com/t/171121/deflating-subcutaneous-emphysema
http://ijasvm.com/ijasvmadmin/upload/IJASVM_5113cbc51d31b.pdf