Hi All, I'm wondering what to do (and how concerned I should be) about a damp spot and possible mold in an interior basement wall. The spot showed up about a week or two ago -- about a week after I had an overflowing toilet in the bathroom above it. Not a lot of water; perhaps 1-2 gallons, which was cleaned up right away. I've attached a couple of photos and have put a 67mm (2.5) lenscap in the photo for size. Thanks -- I really appreciate it.