Warts are rough skin growths in the outer layer of the skin that are caused by viruses.
They can grow over the entire body. There are at least 60 types of these viruses. Some people are more resistant than others to the viruses and do not get as many warts. Yes, warts can be passed from one person to another, often indirectly. It is often several months between the time of the transmission and the time when the wart grows large enough to be observed.