Hello, I just bought a 13 year old house. We were in the process of pulling up the old carpeting to replace it and realized the subfloor appeared damp. It was this way in several of the rooms so far. In the master bedroom there appears to be some black mold stains. Do I need to get this tested by a professional and what do I need to ensure that the moisture problem does not return? Also, what is the best way to remove the mold? Thanks for the help.