I have a large damp patch in the corner of the bedroom, one wall is internal and one wall external. It started off as a small circle above the picture rail on the external wall which turned white but it has become larger and spread out, now the whole corner is damp and is growing white 'fluffy' mould, it is also travelling down the wall where the walls meet. The wardrobes are against the internal wall (5cm gap) and the clothes are now starting to get damp. I have tried to clean it off but it keeps growig back (as predicted) and sometimes has black mould also.
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