Plantar warts appear on the soles of your feet and toes and are spread by contact with moist, well-traveled surfaces like public showers and washrooms. Caused by HPV (type 1), the skin around the wart forms and thickens so it feels like a marble in your shoe. Prevention is key. I tell my patients to always wear flip flops in public change rooms and at the pool. Treatment varies depending on the physician, but it usually requires several visits two weeks apart. A wart can get better on its own after 2 years, but it can feel like a lot longer!