Blood smeared hens eggs?

[poiuytrewq]

We have had two just recently (last fortnight)
The hens that laid them are fine I checked them over and there was no obvious damage, both eating and drinking.

 

[Suelin]

Happens sometimes. No need to worry.

 

[jrp204]

http://www.alltech.com/sites/default/files/alltech-egg-shell-quality-poster.pdf

May be useful.