Just found mold in my apartment

[cbloom]

So my bed is pressed up against the bedroom wall, has been for one year, and I just moved it today to get to an outlet. I noticed there was black mold growing on the wall behind the bed.

So, I was going to clean it up tomorrow with bleach and all that but I dunno if y'all know about these things -

Am I gonna wreck the paint or something else bad cleaning it?

Should I get a test for that toxic mold that everyone is talking about now?

Is it likely that it's growing inside the wall or something?