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.
A rash of itchy spots turns into fluid-filled blisters. They crust over to form scabs, which after a while drop off. Some children only have a few spots, whereas others have them over their entire body. The spots are most likely to appear on the face, ears and scalp, under the arms, on the chest and belly, and on the arms and legs.