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Hi all, thank you for the comments. Below are two more pictures, one with coin for size and other to show corner of two walls (internal corner).

hi Steve thanks for calming my nerves Attached are the pictures - is it mildew?

We have just moved into a 1930s semi. Started redecoration project with stripping wallpaper in rear bedroom facing garden. We notice the walls underneath have been skimmed. But we also noticed small black marks spread across the walls, images attached, what are these? Are they serious? Do we...