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@Airhead
Looks similar to a problem I have with a shower door! Is water getting trapped in the channel at the bottom of the door and seeping through to the wall.
I had a problem similar to this on an outside door and nothing worked in terms of fixing it. I cut out all the internal plaster and plastered it with Toupret Humiblock then painted it with the matching paint. It solved the decorative problem, of course it means the moisture is trapped in the wall but it no longer shows! We had exhausted all the other options though.