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.
Wart facts. 1  Warts are small, self-limited tumors caused by one of over 100 types of human papillomaviruses (HPV). 2  The clinical forms of warts include common warts, flat warts, plantar warts, periungual warts, filiform warts, and genital warts. 3  Warts typically disappear on their own with time, but it may take years.