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.
1 Redness of the face in localized areas or covering the entire face. 2  A tendency to flush or blush easily. 3  A burning or stinging sensation of the face. 4  Increased number of spider-like blood vessels (telangiectasia) of the face. 5  Rhinophyma (red, bulbous nose) 6  Pimple like skin eruptions.  Watery eyes with redness.