Blood spots are also called meat spots and sometimes found on an egg yolk. Contrary to popular opinion these spots do not indicate a fertilized egg. They are caused by the rupture of a blood vessle on the yolk surface during egg formation, or a similar accident in the wall of the oviduct. Only about 1% of all eggs produced will have this blood spot.
As an egg ages, the yolk draws water from the albument to dilute the blood spot. So a blood spot actually indicates that the egg is fresh! This is the reason that farm fresh eggs tend to have more blood spots - they are fresher than store bought. The eggs are fine to eat, in fact they are chemically and nutritionally quite good.
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