I live in a terraced cottage built in the 1800's and have noticed two patches either side of the fireplace which are darker. On one side the lining paper has also not stuck down properly.
When we redecorated the living room a year ago there was a similar problem with the paper that was already there but assumed it was because it had been there for years. However when we redecorated a year ago the same issue reappeared but has not got worse. The floor and skirting boards are fine and there is no sign of damp in the cupboard next to the worse patch. It is on an inside wall which is between the neighbouring property and our cottage.
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I have added photos of the two patches.
My research is pointing towards rising damp, but I really hope it is not. Can anyone give me a clue as to what it could be and how to fix it?
Thanks.