

Is this mold or something else? And how to clean it ?
Cleaning before going out of the dorm room for the summer. Bottom of the wall next to bed is black. I am unsure if it is mold or humidity made dust stick to the wall, or something else.
From my experience with mold it is... much more "colorful" and hairy looking. This ain't either.
So if it is mold I need to report it, if not I need to clean it, or if it is too much work report it still.
So what is it, can you offer any help, do I need to take a better picture.
Any advice is helpful, thank you in advance!
P.S.
For any bad writing I apologize, english isn't my first language and I don't use it nearly as much as I used to