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.
The facial redness with lupus exists in a butterfly pattern (butterfly rash) and does not involve the forehead. Lupus patients can also have skin rashes on other parts of their body, which often develop or get worse after sun exposure. Lupus is frequently diagnosed by antibody testing. Rosacea. The facial redness of rosacea involves the cheeks, nose and the forehead and develops gradually. It starts out as a redness of the face that resembles facial flushing that does not to go away and in many cases looks like sunburn.