I have recently discovered some stains on my living room wall. The stains are a bit colder than the surrounding area, but don't feel wet. At first I thought it may be condensation, but I rarely spend time in the living room and open the windows in the apartment regularly. My colleague has suggested a leak since the stains are in a straight line. From the outside of the house I cannot see any cracks or anything unusual. There is a small plant growing in the gutter, but again, no visible damage.
I have ordered a hygrometer in order to check the humidity, but would be grateful for any input as I would like to have this issue solved before mold develops.
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