Help what is this?

[Lkwdchicken]

Today my wife noticed this bump on the back of our barred rock chicken. Any ideas what it is or what to do about it? Could it be a abscess? The bump is about the size of a small marble if that helps. Thanks for you help!

 

[Lkwdchicken]

Please anyone?

 

[mrsfilmman5]

could it be a bug bite?? is it hard or squishy?

 

[charsbird]

could it be an ingrown feather?

 

[ChickonInc]

That's odd, It could be a infected wound.