Blood on outside of egg

[featherbaby]

There was blood smeared on the outside of a silkie egg I gathered. I checked the vents of all the hens and found no evidence of blood. Should I be worried about this? Is one of my hens bleeding internally? I've had no illness or injuries in months and see no signs of trauma (other than the heat!). What do you think happened?

 

[cterbizan]

Here check this out.....
http://www.thepoultrysite.com/publications/1/egg-quality-handbook/25/stained-eggs

 

[Cats Critters]

I have had a couple do that for no aparent (sp?) reason, my thought is the might have pushed to hard/weird shaped egg/ big egg and a couple small blood vessels broke.