I've got a few bits of plaster that were blowing outwards but no visible damp feeling on the surface.
It looks like the skirting has warped slightly too.
Today I poked my finger on the blown bit of plaster and it is crumbly and sand like. Doesn't feel very damp but is slightly damp.
It's such a small patch but has been like this for a while now.
It's a concrete floor beneath.