need help. very scared.

[Chicky2010]

my chick has a bubble near his chest. its in his skin it looks like its full of air. does anyone know what this is?

 

[ranchhand]

Can you get a pic? How old is the chick? Could it be the crop?

 

[Chicky2010]

i'll upload a pic tomorrow. i didn't notice it until yesterday when i gave it a bath and there was a bubble near the bottom of his neck. it was clear. the chick is wild and i have had it for about a month now. it already had colored feathers when i got it but was very small.