mold behind drywall near plumbing 77

https://publishoryx.com/s/lpN_fZfSy8XmFWGTrDmxH

There's a musty smell coming from the bathroom wall, and when I peeked behind the baseboard, I spotted black spots spreading on the drywall near the shower pipe. The plumbing connection must have been sweating or leaking slowly for months, trapping moisture against the gypsum board. I'm worried the mold is already deep in the insulation.