Skin spots are a common skin condition that can be caused by a variety of factors. FRECKLES, which are small, flat, round spots on the skin, are one type of skin spot. FRECKLES are usually brown or tan in color and are caused by an increase in melanin production. Nevi, also known as moles, are another type of skin spot. They are usually darker than FRECKLES and can be raised or flat. Macules are flat, discolored patches of skin that are usually lighter or darker than the surrounding skin. They are usually harmless and can be caused by sun exposure, aging, or certain medications.