u/Admirable_Employ6792

Hi!

My family and I moved into this house a little over a year ago. We started noticing a few stains, primarily the C-Shaped one a few months int moving in. I h had painted it over thinking an overcoat would cover it.

Come this year, the stain gradually started to come back along with other ones, some areas being really dark. These areas are not moist, do not have any water lines passing behind the drywall.

Any ideas what it might be causing this?