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.
How to Get Rid of Age Spots Naturally. Age spots, also known as liver spots, typically appear on the face, hands, shoulders, forearms and other areas of skin regularly exposed to the sun. According to the Mayo Clinic, age spots appear most frequently in adults over the age of 40, though they can also affect younger people.