A herniated disc may be caused by: 1  Wear and tear of the disc. As you age, your discs dry out and aren't as flexible. 2  Injury to the spine. This may cause tiny tears or cracks in the hard outer layer of the disc.
Definition of wart. 1a : a horny projection on the skin usually of the extremities produced by proliferation of the skin papillae and caused by any of numerous human papillomaviruses âcalled also verruca vulgarisb : any of numerous similar skin lesions not caused by viruses.
Warts are small, usually painless growths on the skin. Most of the time they are harmless. They are caused by a virus called human papillomavirus (HPV). Some types of warts are spread through sex. Certain warts have an increased risk of cancer. Your health care provider can discuss this with you.