A mold problem can usually be seen or smelled. It produces a musty odor which can be the first indication of mold infestation. Mold growth often appears as discolored, slightly furry, or slimy patches that increase in size as they grow. If you can see or smell mold, have excess moisture or water damage, you can assume already that you have a mold problem. Overall, the best practice regardless of the type or amount of mold is to promptly clean up any mold growth and to correct the water problem that caused it to prevent it from recurring.