So what do you do if you have mold? My first tip is do not put a fan on mold ever. When you put a fan on mold, you're blowing around the mold spores just like a dandelion in your lawn. You're spreading seeds everywhere and you actually make the problem worse.
So what can you do if the mold is on a wall in a small area? You can take plastic, just simple visqueen or plastic, and you can cover that mold area with plastic and tape and seal it off so that then you can figure out what your next steps will be. If the mold area is larger like an entire room One thing you can do is close down that room and don't go in there. We're really concerned about the health hazards with mold spores entering your body. At that point, you can call a mold professional and get them to check out the problem to see what's going on.
If the mold is in an attic space, don't run your HVAC unit just in case you just don't want to spread mold or have a lot of air movement. So in that case, you definitely want to get an industrial hygienist, a mold testing company, or a mediator to take care of the problem.