What are the brown specks in eggs?
Hereof, what causes dark spots in eggs?
Occasionally you'll find a tiny dark speck on or near the egg yolk when you crack it open. In the industry they're called “blood spots.” These spots have nothing to do with fertilization. They are actually created when a tiny blood vessel ruptures during the formation of the egg inside the hen.
Keeping this in consideration, is it OK to eat eggs with blood spots?
Blood spots are uncommon but can be found in both store-bought and farm-fresh eggs. They develop when tiny blood vessels in the hen's ovaries or oviduct rupture during the egg-laying process. Eggs with blood spots are safe to eat, but you can scrape the spot off and discard it if you prefer.
These tiny spots do not indicate a fertilized egg. Instead, they are caused by the rupture of a blood vessel on the yolk surface during formation of the egg or by a similar accident in the wall of the oviduct. Both chemically and nutritionally, eggs with blood spots are fit to eat.