mold behind drywall near plumbing 14

https://storyquanta.com/s/ry06tFi-5w5BOAUJhqUyd

There's a musty smell coming from that wall near the bathroom, and when I peeked behind the baseboard, I saw dark spots spreading on the drywall. The plumber said it's mold from a slow leak in the pipe—enough moisture to let it grow unseen for months, probably weakening the wall and the air quality in the room.