One of my hens has who started laying in Nov. lays eggs with tiny clustered balls on the shell of her eggs. insides are normal, is this common? Her egg shape is normal and color is also normal and the tiny balls are same color as the rest of the shell, it's just weird. Could it have anything to do with the stress of the cold? She has been laying these eggs only for the last month and it has also been our coldest temps.