I suspect this is some sort of damp problem but I don't really know. It's in my kitchen and the other corner looks similar like the bead is rusting and pushing the plaster away It's an external wall (cavity wall I believe). I don't even know what trade to ask to look at this. Any ideas?
it’s usually moisture in the wall that ruins them but not always. could be just moisture in the air. It looks like a mesh bead, which rust for fun.
It can be cut out and replaced or cut out and filled and sanded back square.
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