What causes this?

[Peachii]

Recieved this in my hatching eggs I ordered on Ebay, and I'm just wondering what would cause this? It bulges along the "crack". No crack on the outside of shell.

 

[cavemanrich]

Not sure of cause,,,, but just incubate and see if you get successful hatch. (nothing known to correct this) Remember that shipped eggs have less success in hatching VS your own, or some that you acquired and brought home yourself.
WISHING YOU BEST,,,,,,,,,,,,,,,,,,,,, and

 

[annaBsChick]

that egg is not fertile.