Mold growth often looks like spots but can be many different shapes and colors based on it's maturity. Mold spores will grow on any place that provides the food source it needs such as paper products, cardboard, drywall, and wood products, just to name a few. Mold is found everywhere, indoor and outdoors, but needs a food source and moisture to become viable. People that are sensitive to mold may experience allergy type symptoms.
Excessive moisture and/or humidity in your crawl space can be detrimental to your home and your health. It enhances spore growth causing fungus, mold and mildew in your sub-floor structure. It can also affect the indoor air quality and humidity inside your home, leading to unhealthy living conditions.