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.
The spots in acne rosacea are basically the same as with acne vulgaris (although usually no blackheads), except itâs also accompanied by a red rash that usually covers the nose, cheeks, forehead, and chin. It primarily affects women over 30 and is probably the most common type of acne after vulgaris.his type of acne that consists of large nodules and pustules that can be very damaging. It is basically the same as acne fulminans but usually only affects women between ages 20 to 40, comes on suddenly, only affects the face, and usually disappears within a year.