A value of NULL indicates that the value is unknown. A value of NULL is different from an empty or zero value. No two null values are equal. Comparisons between two null values, or between a NULL and any other value, return unknown because the value of each NULL is unknown.
Skin Spots on the Face. Most causes of spots on face are harmless. They can be a variety of colors including white, red, black or brown. Common causes include cumulative sun exposure, acne, and skin tags. Keratoacanthoma (hyperkeratosis) is a lesion that grows rapidly, usually on areas exposed to the sun.
After a lifetime of being exposed to the sun, you're bound to have multiple consequences, including brown spots on your hands and face. Age spots, technically known as solar lentigines, are well-defined, uniformly colored areas of brown or grayish pigment that generally show up on the hands, face, neck, and chest.