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 term, âliver spots,â can be alarming. However, these spots have nothing to do with your liver and liver function. Also known as age spots or solar lentigines, liver spots on face are light brown to black patches that are usually flat and oval that appears on your face and skin. Although they vary in size, these spots can grow on the face, hands, shoulders and arms. In other words, on areas that are most often exposed to the sun.