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Questions that usually arise (har ironic har) for damp that looks like that - is that corner heated and ventilated, and what does the guttering look like above it? Might find that when theres heavy rain, the guttering is overspilling and getting onto that corner and showing up there.
Google efflorescence too - it's most probably salts coming through the wall instead of something properly hazardous like mould.
Edit - even when you sort the problem, the figure that gets touted is that it take a month for every inch of brick thickness to properly dry out. So you could be looking at a good year before permanent redecorating is on the cards for that low corner of the room.
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Any thoughts on what I need to do?
Put the chest of drawers in that corner.
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Worth bearing in mind these problems can come from above. I've had a couple of them where the problem turned out to be weeping radiator joints on the floor above. Took a long time to find it, in the mean time I had stripped the plaster off and replastered with a waterproof filler.
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Looks like it's where the filler would have been, so potentially it's just that absorbing moisture (like the canary down the mine), maybe not helped by a metal back box on an exterior wall. I don't want to think it's anything sinister . Sealing over with bin should slow this - think I'd also prefer a ready mix filler over a powder mix
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1900 semi detached house, external south west facing first floor corner, this room was plastered and decorated three years ago and now this. Any thoughts on what I need to do? We're likely moving a three year old in here soon, so OH is keen for some action. Cheers.