mold behind drywall near plumbing 9

https://easypdfshare.com/s/GpLmYKOhENOqQ6NwZ4Qrn

I noticed a musty smell near the bathroom sink and when I peeled back a corner of the drywall, there was black mold spreading behind it where the pipe had a slow leak. It's been growing in that damp spot behind the wall for a while now.