We recently had a pinhole leak in one of our walls, and have since had it remediated. Drywall, torn out and a good portion of the floor and one room torn out as well. The room still smells a bit musty, but I chalked that up to everything being exposed in there. Supposedly we had an all clear after an air test.

All that said, I walked in there today and noticed this on the ground. Looks to be mold? Anyone have any idea what this could be or why would be showing up after we had a full remediation done?