Damp appearing on internal wall

Damp appearing on internal wall

Damp appearing on internal wall

Hi,

We are complete novices at house stuff so learning as we go.

Randomly a damp patch has appeared from on an internal wall. From the bottom upwards. Also some bulging plaster from where there has been previous fittings. The other side of wall is a conservatory. Wall doesn't feel wet anywhere. House is 1920s. We've lived in it about 4 years There is no radiator on this wall. Any ideas? Also how to stop it/fix it? Photos attached. Thanks in advance for any advice that can be given

by gee3po

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