identify mold under carpet

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When you peel back a corner of carpet and spot fuzzy black or green patches, that's likely mold thriving in the damp padding or floor beneath. It often comes from hidden leaks or high humidity, and you'll notice a musty smell before even seeing it. Carefully lift the carpet to check for dark stains or powdery residue, and wear gloves and a mask if you find any, as mold spores can spread fast and cause health issues.