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.
More detail and supporting information is in the main article. 1  A wart is a small growth on a person's hands or feet. 2  There are several types of wart including common warts, verrucas, plane warts, filiform warts, and mosaic warts. 3  Most warts disappear on their own and do not need to be medically treated.