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.
Facts on Warts. Warts are small harmless tumors of the skin caused by a virus called the human papillomavirus. The appearance of warts can differ based on the type of wart and where it is located on the body. Most warts are well defined, with skin thickening.