Cantharone for the Treatment of Perenial Warts

A thin film of cantharidin is applied to the surface of the wart and to 1 millimeter area surrounding the wart. After the film dries, it is covered with an occlusive dressing for 24 hours. The patient removes the area the next day and thoroughly washes the area with soap and water. Patients return to clinic a week later.

Trichloroacetic acid is applied to the surface of the wart with a wooden applicator and after drying the area is washed with soap and water in an hour.