Spots on the *inside* of the eggshell?

Supernatural

In the Brooder
9 Years
Aug 7, 2010
62
3
43
Des Moines
Sometimes my chicken eggs have spots - grayish, almost looks like mildew - on the inside of the eggshell. Obviously, I don't notice this until the egg is cracked into my frying pan.

Anybody know what causes this? Are the eggs safe to eat?
 

margaritamama

Hatching
8 Years
Mar 27, 2011
5
0
7
Sometimes my eggs have blood spots inside and as the egg gets older the spots get darker or more gray rather than red. Could that be it?
 

Supernatural

In the Brooder
9 Years
Aug 7, 2010
62
3
43
Des Moines
Well, they're not part of the egg, just on the inside of the SHELL. We do get some meat spots occasionally from one of our hens, but in the egg white. I wonder if that could be related? Just not sure if this is a problem or not.
 
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