Warts are caused by viruses and need air and moisture to survive. Castor oil applied religiously will cut off both and the plantar wart will disappear in a matter of weeks. Much better than paying a Dermatologist to have the little buggers burned or frozen, only to be left with visible scars.
I agree, Castor oil removed a wart from my sisters neck... It was a stubborn one and she tried lots of things to get rid of it. Only the Castor oil worked, without leaving a scar behind.