Black spots appearing in the corners of walls might seem minor at first—a smudge or speck of dirt—but over time they can spread, darken, and emit a musty odor. While it’s not cause for panic, these spots often signal a deeper moisture problem behind your walls. Acting quickly can prevent further damage and restore a healthier home environment. Excess moisture is usually the main culprit. Poor air circulation in bathrooms, kitchens, or rarely aired bedrooms allows humidity to linger. When it meets cold wall surfaces, condensation forms, creating ideal conditions for mold growth. Leaks from gutters, roofs, or foundations, as...
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