Neem absorbs viruses and prevents them from infecting cells. Since warts are caused by viruses, neem is effective in treating them. To treat the wart, cover it with whole neem leaves or soak the gauze portion of a small bandage with neem leaf extract or a neem based cream and place it over the wart. Change the bandage and reapply daily. After a week, check the area to determine the progress of the treatment.