Noticed these dark grey bands forming along the edges of the carpet in every room near the baseboards. We don’t wear shoes inside, but the perimeter keeps turning black no matter how much I vacuum. Is

when these stains could indicate a more serious problem, such as mold. Mold growth in carpets is often accompanied by a musty odor and may appear as irregular patches rather than uniform lines.

If the dark edges are accompanied by dampness, water stains, or peeling paint in nearby areas, this could be a sign of water intrusion, which can foster mold growth. In such cases, it’s important to address the underlying moisture issue to prevent further mold development and potential health risks.