Black Spots on Onions: What They Mean and What You Should Do0

• A to Z, Food Hygiene, Food Safety, Health & Wellness
• June 12, 2025

Onions are a key ingredient in most Indian kitchens, but sometimes you may find black spots on their skin. These patches are usually caused by a fungus called Aspergillus niger, which leads to black mould. While it often grows on the dry outer layers, it can sometimes spread deeper into the onion, especially in warm,