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.
A wart is typically a small, rough, non-cancerous tumor that grows on the top layer of skin. They often resemble a solid blister or a cauliflower, and can seem either very light or very dark compared to the normal skin surrounding it. They're usually painless, but can cause itching and burning if they are in high-friction areas.