For a plantar wart on a 2-year-old's big toe, it is best to start treatment with over-the-counter salicylic acid. Soaking the foot, gently rubbing the wart with a pumice stone, protecting surrounding skin with petroleum jelly, applying the salicylic acid, and covering with a bandage twice a day for a minimum of 12 weeks can help treat the wart. If this treatment does not work, consulting a doctor for cryotherapy or Canthacur may be necessary. Remember to wash hands thoroughly after applying the treatment to prevent spreading the wart.