blood on the outside of egg...

[swatchick]

It sounds like you found the source in your case, but just for info -- I had the same thing occur the other day, and when I looked over all the hens I saw that one had dried blood on her comb. It turns out that there have been some skirmishes over the most desirable nest box (and mind you, there are plenty of them, and they are all the same, but apparently one is better than all the rest.....

) and this particular hen just shoves her way in whether it's vacant or not -- and my best layer is not down with that at all, so I'm surmising that 'pushy hen' stuck her big self in there when 'the queen' was on the nest and got her comb nipped. Then, when she did lay an egg, she dripped blood on it as she pushed it around in the box...

 

[Betty1]

I just found the same thing on my egg, do I wash it and how

 

[jrfadfarm]

following...

 

[Greggs]

See this post for handy information about blood on eggs
https://www.backyardchickens.com/t/...mer-in-chicken-vent-anatomy-and-common-injury