Sometimes mold growing around the perimeter of a socket or switch is a sign of moisture behind that wall (poor insulation, water seeping from a leaky pipe or a hole in the roof…). I’ve never seen it form a ring like that though, usually it’s right on the edge of the outlet plate.
Sometimes mold growing around the perimeter of a socket or switch is a sign of moisture behind that wall (poor insulation, water seeping from a leaky pipe or a hole in the roof…). I’ve never seen it form a ring like that though, usually it’s right on the edge of the outlet plate.