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 skin growths caused by the human papillomavirus, or HPV. Common warts are generally painless, small raised bumps growing on the outermost layer of the skin and are rough to the touch. Common warts most often develop on the hands in areas where the skin has been broken such as that of a hangnail.