Hi all. I rent a 2 bedroom flat but the second bedroom is very rarely used. I've gone in today and noticed these weird marks on the carpet. I've certainly not spilt anything on there.
I don't use the bedroom because it doesn't heat up very well and there was a mould issue on one of the window frames. I'm concerned this could be mould growing under the carpet. Thoughts?
will post pic in the comments as the app won't let me