The chalazas constitute a specific anatomical formation of the avian egg. They are made up of high density proteins and have as mission to keep the yolk in the center of the egg. Although the presence of blood in different parts of the egg is not considered dangerous for human consumption, some of these hemorrhagic lesions have pathological origin derived from the process of their formation. The picture shows the hemorrhage at the junction of the yolk with the chalaza. Although there is a genetic influence in this lesion, it has been linked to the consumption of poor quality food, due to their low content in biotin and magnesium.