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.
Ticks, it says, also can spread Lyme disease, human babesiosis, and Rocky Mountain spotted fever. The magazine says people should follow directions and use their hands to apply the repellent to the face. It urges people to keep the repellent out of eyes, mouths, and cuts and to use just enough to cover exposed skin.