What is this... is it mould and how do I rid it?

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Hi all,

I have a small pantry which is an extension of the kitchen and almost all 4 walls are to the outside environment. The kitchen is fine but the walls here look very strange. The outer surface under the dark-coloured bit peels/crumbles under my hand and there is a hard but slightly crumbly concrete (I think) underneath. after a few mm its hard concrete. Im not sure what the hard bits on the wall are... looks like sea limpets!
Do I need a specialist?

Can I just plaster it and then paint with antimould paint?

Thanks in advance

Suze
 

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Isn't it efflorescence from damp?
 
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You need to find and rectify the source of water. Is there a drain outside? Or a water pipe under the floor?
 
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