A wart is actually a type of proliferative skin damage caused by an infection with the HPV virus. So, most wart is actually infected with a skin virus called human papilloma virus. When this virus infects the body, it produces a proliferative and keratinizing reaction, most commonly in the form of common warts, and flat warts. In addition to these two types of warts, you can also see infectious molluscum contagiosum, which is caused by infection with molluscum contagiosum. If HPV infection occurs, the virus needs to be treated aggressively, otherwise it can affect the body’s immune system.