Egg issues! Is this a concern to their health?

[Moonrisecityfarms]

Hey all! I have a question about the concern of wrinkling eggs and eggs with spots on the bottom that may or may not be blood. The spots do not wash off as I wash my eggs.
not sure if this is a health concern or if I should be aware of an issue going on in my flock one of the wrinkling eggs maybe from a rescue bird and I’m not sure of the status of her health growing up.

please answer with detail if you know anything about these things thank you!
-moonrise city farms backyard chickens

 

[JaeG]

https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/
This article might help pin down an explanation.

The eggs in the first photo look more like they didn't quite get painted thoroughly perhaps? Is the shell thinner where it's darker?

 

[Moonrisecityfarms]

https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/
This article might help pin down an explanation.

The eggs in the first photo look more like they didn't quite get painted thoroughly perhaps? Is the shell thinner where it's darker?

Not thinner

 

[LaFleche]

The hen that laid the egg in the second picture might be suffering from Infectious Bronchitis:
https://www.msdvetmanual.com/poultry/infectious-bronchitis/infectious-bronchitis-in-poultry