A red tint in your egg white usually comes from one of two causes: a small blood spot that diffused into the white, or bacterial spoilage that has turned the albumen pink. The difference matters because one is harmless and the other means you should throw the egg away immediately.
Blood Spots That Spread Into the White
The most common reason for a reddish streak or spot in egg white is a blood spot. These happen when a small blood vessel ruptures during the egg’s formation. Blood spots found on the yolk typically mean bleeding occurred when the yolk was released from the ovary. Blood spots in the egg white indicate bleeding happened slightly later, after the egg entered the oviduct where the white is deposited around the yolk.
A fresh blood spot looks like a small, distinct red or dark red dot. Over time, though, the yolk absorbs water from the surrounding white, and that process can dilute and spread blood spots so they look more diffuse and pinkish rather than like a sharp red speck. If your egg has been sitting in the fridge for a while, a blood spot that started on the yolk can end up looking like a faint red tinge through the white.
Blood spots are safe to eat. They’re a cosmetic defect, not a sign of contamination or fertilization. You can pick the spot out with the tip of a knife if it bothers you, or just cook the egg normally.
Meat Spots Are Different From Blood Spots
You might also see brownish flecks in the egg white. These are called meat spots, and they consist of small pieces of tissue or cellular debris that broke off from the hen’s oviduct during egg formation. They tend to look brown or tan rather than red, and they’re most often found in the white rather than on the yolk. Like blood spots, meat spots are harmless and don’t affect the safety of the egg.
Pink or Iridescent Whites Signal Bacteria
This is the cause you need to watch for. If the entire egg white looks uniformly pink, pinkish-red, or has an iridescent sheen, the egg is likely contaminated with Pseudomonas bacteria. The USDA specifically flags pink or iridescent egg white as a sign of spoilage caused by these microorganisms, and some strains are harmful to humans.
Pseudomonas bacteria produce a fluorescent, water-soluble pigment that gives the egg white its unusual color. They also break down the proteins in the white itself, so a contaminated egg often looks watery or thinner than normal in addition to being discolored. The smell can also be off, though not always dramatically so in early stages of contamination.
If your egg white has an overall pink or iridescent appearance, do not eat it. Discard the egg, and wash anything it touched.
How to Tell the Difference
The visual distinction is fairly straightforward once you know what to look for:
- Blood spot: A small, localized red or dark red dot, sometimes with faint pink streaks radiating from it. The rest of the white looks normal, clear or slightly cloudy, with a firm texture.
- Bacterial spoilage: The white itself is tinted pink throughout or has an iridescent, almost pearly quality. It may look thinner or more watery than a healthy egg white. There may be an unusual smell.
If you’re unsure, trust your nose. A spoiled egg almost always smells wrong, even if subtly. A blood spot in an otherwise fresh egg won’t change the smell at all.
Why Commercial Screening Misses Some Defects
You might wonder how an egg like this made it into your carton. Commercial egg facilities use a process called candling, where bright light is shone through the shell to reveal internal defects. Modern systems use cameras, spectroscopy, and even machine learning models to automate this process and flag bloody eggs, cracked shells, and dirty eggs.
But these systems aren’t perfect. Historically, eggs were inspected by hand, a method that was slow and subjective. Today’s automated detectors are much better at catching cracks and large blood spots, but small spots or early-stage bacterial contamination inside an intact shell can still slip through. Brown-shelled eggs are particularly tricky because the darker shell makes it harder for light-based detection to spot internal discoloration. Research on brown-shell eggs has found they have a higher incidence of both blood and meat spots compared to white-shell eggs.
What Increases the Risk
Blood spots are more common in eggs from older hens and in certain breeds. They’re a normal biological occurrence and don’t reflect poor farming practices. You’ll encounter them more often with farm-fresh or backyard eggs that haven’t gone through commercial candling at all.
Bacterial spoilage, on the other hand, is a storage and handling issue. Eggs that have been stored too long, kept at inconsistent temperatures, or have microscopic cracks in the shell are more vulnerable to Pseudomonas contamination. Keeping your eggs consistently refrigerated and using them before the expiration date significantly reduces the chance of cracking one open to find a pink surprise.