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 term sideburn is the namesake of Ambrose Burnside (pictured). Sideburns, sideboards, or side whiskers are patches of facial hair grown on the sides of the face, extending from the hairline to below the ears.s with beards, sideburns went quickly out of fashion in the early twentieth century, and in the First World War in order to secure a seal on a gas mask, men had to be clean-shaven; this did not affect mustaches.