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.
As these symptoms go away, the first patch of pityriasis rosea is seen on the skin. This can be up to 10 cm across and is known as the herald patch. This usually appears on the abdomen, chest or neck, but can affect the face, scalp or genital area. Some days to two weeks later a secondary rash appears.