woodsmith
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Do you know how the wall is constructed? This looks like a new build rather than a conversion but round dots on plasterboard are normally caused by damp bridging from the outside wall through the dab of adhesive which is used to fix the plasterboard to the wall. Same round the window/door, you can get the same problem as a bead of adhesive is used all round the window to bond the plasterboard in place. This sort of problem would not normally happen with a new build though as the cavity wall protects the plasterboard, but I've seen it a few times in older houses with solid walls.
Perhaps the room has not had enough ventilation as it is drying out and this is where condensation is forming causing the mould to grow?
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