Found this weird lump in my concrete wall, the plaster around has crumbled off, any ideas as to what this may be??

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PHWX

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I think they're like a lignacite block. There was a reaction that happened once the cement/lime in the render touches it. It expands then blows out. A whole estate near me has this problem. I think a 60's or 70's estate.
 
If you’re finding any kind of lump my advice is go doctors immediately! Ya can’t mess around with these things (y)
 
Looks like a piece of cat shite that would often be in the sand and cement.

Yes, but these are/were in the blocks themselves.

When you look close, its like small carbon or black soot or Ash. It reacts and blows out when rendered over. Probably organic or something.
 
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