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.
Shingles is an infection that produces fluid-filled blisters on the skin, often near certain nerves. It may spread to the eyes. If the varicella-zoster virus spreads to nerves in your head, your face, eyes, and nose may be affected. The virus can cause several problems, including: Blisters on or inside your eyelids. Damage to your cornea (the clear dome on the front of the eye). Uveitis (inflammation to eye tissues behind the cornea). Glaucoma (increased pressure inside the eye). Cataracts. Several medicines are helpful in treating herpes zoster eye infections.