When growing indoors, mold has a black spotted appearance. This is because mold is a fungus that grows from little spores, giving it its unique appearance.
Mold that grows indoors is often ignored because it looks different than the green type of mold that grows on bread, cheese, and milk. That type of mold is green because it forms by feeding off different types of bacteria.
Mildew is commonly mistaken for mold, but the difference between their appearance is color and shape. Mildew gives off a gray splotchy appearance, rather than the black and speckled mold appearance.