Black spots on onions may indicate harmful fungal infection. Learn why peeling isn’t enough, the risks of consuming contaminated onions, and expert tips for safe storage.

Black spots on onions may seem harmless at first glance, but experts warn that these dark patches could indicate a serious fungal infection. Simply peeling the outer layer may not protect you from potential health risks.

Kanika Narang, Deputy Manager and Head of the Dietetics Department at Indraprastha Apollo Hospitals, Delhi, explains that these black markings are not just dirt or discoloration—they are often caused by a fungal infection, commonly Aspergillus niger, also known as black mold. This fungus can thrive in damp and warm environments, especially when onions are stored improperly or have damaged skins.

The infection usually begins at the onion’s neck, roots, or between layers, showing up as black, powdery spots. While they may appear superficial, the fungal spores can spread internally, making the onion unsafe to consume.

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Can You Eat Onions With Black Mold?

Many people believe scraping off the dark spots makes the onion safe to eat, but Narang cautions that this is only partially effective. Mold filaments can penetrate deep inside the onion, meaning peeling the surface may not remove all contaminants. The safest approach is to discard any onion that shows black mold, off odors, or softening, which are signs of internal decay.

Even a small contaminated portion can expose you to harmful mycotoxins, which may cause allergic reactions, gastrointestinal problems, or respiratory issues in susceptible individuals.

What to Do If You’ve Consumed a Contaminated Onion

If you have already cooked with a slightly spoiled onion and experience symptoms like nausea, vomiting, stomach pain, or allergic reactions, Narang advises seeking medical attention immediately. Staying hydrated and consulting a doctor is crucial, especially for people with weakened immunity or pre-existing respiratory conditions. Self-medication should be strictly avoided.

Prevention Tips

• Store onions in a cool, dry, and ventilated space.

• Avoid onions with damaged outer layers.

• Discard any onion with black spots or a musty smell.

• Use separate storage for onions and potatoes to reduce moisture exposure.

A single spoiled onion might not always trigger immediate illness, but repeated consumption or ignoring warning signs could lead to serious health complications.

Next time you spot black patches on an onion, don’t risk it. Throw it away to protect your health. As Narang reminds us, “It’s better to waste one onion than compromise your health.”