Bit of damp or old plaster

[swampydrill]

Hi
I got a bit of discolouring in one of the bedrooms halfway up the wall. These are very old houses and i dont know if this is caused by old plaster or what. There looks nothing obvious outside, do i need to get someone to look at this or paint over it ?

 

[JohnD]

looks like damp. What is above it?

Show us a pic of the gutter on the outside wall as well.

 

[swampydrill]

Here you go, my property is on the left

 

[JohnD]

can you get in the loft?

is the wet patch on that gable wall?

had it been raining?

where are the chimneys and the gutter/downpipe in relation to the wet patch?

 

[swampydrill]

The loft wall is bone dry , this has been slowly getting worse for over a year so not drastic. The glittering is at the lowest point of the roof. I think these walls are lime based plaster so I don't know if this is anything to do with it. The areas do not feel wet but do feel cold.