I pulled off a baseboard in my basement and saw some raised black spots, and a few of the nails were rusted. I'm wondering if the spots are mold? If they are, do I need to pull down all the drywall and look back there for more or is this not such a big deal since it's a small amount (from what I've seen).
Is there a way to test what it is?
What would you do?
Sure looks like mold to me.
Why did you remove the baseboard without taking the base moulding off first?
If it's that bad on that side I sure would be interested enough to open up the wall and seeing what's going on behind it.