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.
Mouth of a patient with Koplik spots, an early sign of measles infection. Three to five days after symptoms begin, a rash breaks out. It usually begins as flat red spots that appear on the face at the hairline and spread downward to the neck, trunk, arms, legs, and feet.Small raised bumps may also appear on top of the flat red spots.he symptoms of measles generally appear about seven to 14 days after a person is infected. Measles typically begins with. 1  high fever, 2  cough, 3  runny nose (coryza), and. 4  red, watery eyes (conjunctivitis).