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.
Most of us will have it at some point in our lives. Seborrheic dermatitis usually makes its debut in the winter. It often starts as dry white flakes in the eyebrows and then may spread to the skin between your brows. Around the nose you may develop itchy red skin with a greasy scale. This lovely look often progresses down the crease running along the sides of your lips and onto your chin.