Warts

Caused by contact with the contagious human papillomavirus, warts can spread from person to person or via contact with something used by a person with the virus. You can prevent spreading warts by not picking them, covering them with bandages, and keeping them dry. In most cases, warts are harmless, painless, and go away on their own. If they persist, treatments include freezing, surgery, lasers, and chemicals.