mold behind drywall near plumbing 26

https://wiki-byte.win/index.php/How_Gateway_Water_%26_Mold_Addresses_Hidden_Mold_Behind_Drywall

The musty smell in the bathroom wasn't just leftover humidity; behind the drywall near the plumbing, the constant moisture had created a thriving patch of black mold, spreading along the pipe and up the paper face of the sheetrock, a hidden problem I only found when the wall started showing dark, damp shadows after every shower.