Shell with large deposit--dangerous to hen?

[stretchc1]

One of my five hens is laying eggs with what look like calcium deposits on them. Usually they are little bumps, but today I got this one:

Is this likely to be hurting the hen internally? What causes it?

Thanks for any insights!

 

[Saltysteele]

not sure what causes it, but i can say i've never seen a wart that large!!

if there was no blood on it, i would say most of that damage was the pain of laying that baby

 

[ScissorChick]

Excess calcium deposits. I'm pretty sure that's what that huge thing is..

If so, it will not hurt her.

ScissorChick