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.
Some types of infection that may cause swelling on one side of the face are: 1  Sinusitisâaffects the nasal sinuses. 2  Abscessâcan be on the gum, near the tonsils or in a tooth. 3  Osteomyelitisâinfection of bones of the face. 4  Ocular infections like blepharitis, conjunctivitis or keratitis. 5  Cellulitisâa type of skin infection.