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.
When one side is substantially different to the other side, compared to a small but normal difference between the two sides, then it is possibly time to consult with a doctor to rule out any serious causes of the asymmetry. One Side of Face Swollen: Why? 1. Physical Trauma. Facial injuries are the most common reason for one side of the face swelling. These injuries include car accidents, insect stings or bites, falls on the face, blunt force trauma received in an assault, sunburn on one side of the face, surgical procedures on one side, fractured facial bones.