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.
Dermatologists explain how to get rid of spots on your face, and the best products to help you do it. Age spots, freckles, and other skin discolorations can crop up after too much time in the sun, hormonal shifts associated with pregnancy or birth control, acne, trauma to the skin, orâsadlyâgetting older. And while they can appear for a variety of reasons, they all have one thing in common: theyâre difficult to get rid of.