What Bumpy And Spotty Eggshells Mean

Here's what you should know.

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Have you picked up a carton of eggs and noticed that one or more don't look quite as perfect? It might have an irregular shape or a few bumps on an otherwise smooth eggshell. You might have cracked one open and noticed some spots on the underside of the shell. 

Those bumps and spots you might occasionally find on your eggs are not a sign of anything wrong with the egg itself. It is about the hen who laid the egg. 

Here's what else you should know:

1 Bumps and spots on eggshells are normal. 

It's normal for eggs to be misshapen. Eggs can have bumps that may look like pimples on the eggshell or can even be wrinkled or misshapen. Some eggs with spots on its eggshells are also normal. These irregularities can occur naturally. Sometimes, the cause is an outside factor.

Think of a pearl. A pearl is basically formed from a piece of dirt or another foreign object in an oyster covered in layers upon layers of calcium. The oyster's defense is to cover it and keep the oyster safe from it. That's the same concept behind the little bumps: a piece of debris might be present at the time the egg is made and to protect the egg, the eggshell wrapped around it. This is what causes bumps. 


The spots on an eggshell however are made in a different way. As the egg passes through the oviduct, the tube that encases the egg in a shell, the egg spins to create the perfect egg that is laid. If the egg spins too slowly, it creates spots or are speckled. 

Both are natural and normal and these eggs are normally good to eat. 

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2 The hen was malnourished. 

One of the more likely causes of a healthy hen producing a misshapen egg is linked to nutrition. Just like an undernourished mother can affect her unborn baby, an undernourished hen can form an egg that's not up to the perfect egg standards we are familiar with. 

The types of eggs these hens lay can have thinner shells and may or may not be misshapen, too. The hen could also be laying more irregular eggs than normal as well over a period of time. 

This is why some eggs have more orange yolks than other eggs since the hens were fed a diet with added nutrients. 

3 These can be a sign of sickness or contamination.  

The biggest concern for bumps and spots is sickness. Hens who lay bumpy, spotty, or misshapen eggs regularly may be sick. Eggs that have spots on the inside of the eggshell can be a sign of contamination, too. If you break open an egg and see black or green spots on the inside of shell or even on the egg itself, discard the egg. This is mold and it's best to throw out this egg. 


Still concerned? It's good to know that the Department of Agriculture, or the DA, has regulations ensuring that eggs being sold to consumers are "good eggs" under the Philippines National Standard for Table Eggs. There are minimum requirements for an egg to be a "good egg", and this includes being "free from foreign material and stains or discolorations that are readily visible". The production of eggs are also covered by an international code that monitors food hygiene and must comply with its criteria.  


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