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 (Definition) 1  Warts are outgrowths of the skin, usually caused by a virus. They are self-limited, meaning that they can go away on its own after a few years. ...Read more. 2  Verruca is the medical term for a wart, which is a non-cancerous skin growth caused by viruses. ...Read more.