you most likely had a common wart (verruca vulgaris) not a plantar wart. the word "plantar" means "bottom of your foot" so unless your thumb is on your foot you had a common wart. yes a wart that is incompletely treated can return. or you can simply get another one at another time from a new exposure and this may require another treatment or two. warts are viruses.
i had a plantar wart removed from my thumb. is it possible for this to re-occur? . originally diagnosed as a plantar wart and removed 2004. located on the pad of left thumb and another just under the knuckle on right thumb. what can be done for this?