egg shell has a hole perfectly round but inside egg normal??

[Alvin the chicken]

my egg has a circle perfectly round about the size of the regular fishing worm hole in it but the inside looks normal. Could it be something bad?

 

[sourland]

is this an egg you are incubating or one you plan to eat? Can you post a picture?

 

[nuthatched]

A piece of calcium deposit could have flaked off.