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 an infection of the skin caused by the human papillomavirus (HPV). The virus enters the body through a break in the skin (such as a cut) and then forms a rough bump on the surface of the skin. Warts are benign (non-cancerous) growths.