mold behind drywall near plumbing 12

https://wiki-fusion.win/index.php/What_to_Know_About_Mold_Behind_Drywall_Near_Plumbing_in_a_Rental_Home

There's a musty smell in the bathroom that gets stronger after showers, and I finally found the source—mold behind drywall near plumbing. The previous owners must have had a slow leak, because the wallboard is soft and black spots are spreading behind the vanity.