The EPA states that, "It is important to take precautions to limit your exposure to mold and mold spores. Avoid breathing in mold or mold spores." The EPA also recommends that if you suspect you have a hidden mold problem you should consider hiring an experienced professional to avoid exposure to potentially massive dose of mold spores.
Mold damages what it grows on. The longer it grows the more damage it can cause. If there is a mold problem in your home, you should clean up the mold promptly. Mold can be hidden, growing on the water from a hidden leak, and can develop into a potentially large problem if not caught in time.