Weird dark lump in turkey butt

[Rosypetals]

I need urgent help, this turkey poult has the solid dark lump thing with a hole in it. The poult is extremely weak, I have done everything possible, and I’m prositive this poult will not make it through the night. Can anyone tell me what this lump is? It concerns me.

 

[Rosypetals]

I’m just trying to bump this up so that people actually see this, but I need help quickly if there is something I can do to save her.