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 person with perfectly healthy facial skin may suddenly notice that there are white spots appearing on their face. While often harmless, white spots on the skin can occur due to a number of reasons. The condition can be mild or severe, and generally covers the majority of the skin on a particular area of the body.They may also cause irritation or itching. The occurrence of whites on the face can be extremely distressing.hite spots on the face occur for various reasons. Understanding some of these reasons may be beneficial in treating the condition. Furthermore, understanding the cause can also help people avoid certain circumstances that increase the risk.