Bulge in corner of ceiling

[Daniel Baguley]

First time post here.

There is a slight bulge in the corner of our living room ceiling where it meets the staircase. The bulge is dry and can be pushed upwards. It is a semi detached property which is around 30 year old. We've been in it now for about 6 months now and looks to have just been painted over previously.

Obviously it is a concern. I've attached two images showing this. Any ideas what it might be?

Ps excuse the lack of details, I'm not in construction trade myself.

Thanks,

 

[vinn]

No problem, this site is, after all, for the use of householders and DIY'ers.

Your out of focus photos dont take me much further ahead - can you do photos from further back?
It could be some plasterboard has come loose - whatever, at some stage you will have to open it up so why not do that now or tomorrow if you feel confident?
If it presents difficulties get a handyman in to open up (and maybe fix-up).

Lightly cutting into the plaster board (use a utility knife) until you can remove a small patch and be able to see "inside" so to speak will work - dont cut deep and wear heavy gloves.
Take it there is no elec device in proximity?

What about the floor or landing above - anything suspicious or any floor movement?