Warts are caused by a virus which invades the skin through small and often invisible cuts and abrasions. Warts on the sole of the foot are called “plantar warts.” They can often be mistaken for a corn or callous. Plantar warts often appear hard and flat, with a rough surface and well-defined boundaries. Their color may vary. Often times, there are black dots within them which helps to define them. Treatments for warts may vary. Unfortunately, warts can prove very resistant to treatment or may recur, requiring multiple visits. In our office, we use a strong blistering agent and liquid nitrogen treatments. This produces a blister on the wart area after treatment and has proven to be very effective.