Several treatments. You can try over the counter wart removers, but be careful: i've seen them do more harm than good. Other options your doctor might offer include cryotherapy (freezing the wart), electrocautery (burning the wart), laser treatment, or several different topical chemical treatments. If the treatment is typically uncomfortable, your doctor can numb the area before proceeding.
I use topical meds. It is very difficult to treat plantar warts on your own. The skin on the plantar foot is thick. The virus that causes the wart can hide there. My weapon of choice is a combination of a topical prescription cream as well as an rx of formaldehyde spray or roll-on. My cure rate is 100%. You should see a podiatrist or a dermatologist for this.