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 non-cancerous skin growths caused by a viral infection in the top layer of the skin. The common wart is a small, hard, rough bump that usually occurs on the hands and fingers, but they can be flat and smooth. Salicylic acid softens the skin layers that form the wart so that they can be rubbed off.