shadowy outline of cavity blocks on interior walls

[bibien]

Can anyone advise me about the sudden appearance of the outline of cavity blocks on my interior lounge walls. The outlines look like shadows on the walls and are dusty grey.

I want to redecorate and do not know what to do to ensure this problem does not happen again.

Advise would be very much appreciated.

Regards

Bibien
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[plumbbob]

Most unusual. Is this damp?

[bibien]

Hello

No it is not damp, but have had a lot of condensation.

Another person in plaster and dry lining forum says he believes it is due to cold bridging around the masonry on the blocks.

Thank you for your interest

Bibien