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 white bump around the edges of your lip could be an acne papule or spot. Outbreaks of acne spots around the lips appear when the skin pores become blocked by sebum (the oil the skin produces) and dead skin cells. Bacteria then infect the blocked pore and a spot with a white head develops.