Bubbling on plastered wall

Joined
8 Apr 2026
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United Kingdom
Just wondering if anyone knows what this is?
It's been plastered for over 10 years with no problems but recently some bubbling has appeared.
It's hard to the touch and seems to be spreading slowly.
Any help and advice would be much appreciated.
 
Sorry, thought I'd attached images
20260408_215850.jpg
20260408_215845.jpg
 
Salts.
Scrape a bit off to look.
Any water above?
Radiator. Shower. Toilet or tank ect.
 

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