Hello! I have a chick with a very swollen right breast/side area with bare skin showing. Please help

[anniethemamahen]

I read that this could be her crop because she just went crazy eating. But that doesn't explain why she's a little bare in the spot. I'm very nervous because I have three other chicks with her.

 

[Wyorp Rock]

Can you post a picture?
Sometimes a bare spot can be just loss of down when they are feathering out. Is she being pecked on by any chance?