Corns are a frequent disorder on the foot. Corns are a natural reaction to pressure as the skin thickens up to protect itself from that pressure. At some stage this process fails and gets so thick that it is painful. There is a unrelenting myth that corns have roots which they carry on growing back from once you attempt to remove them. This is just like the analogy of plants that re-grow from their roots if you chop the top of the plants off. This analogy has been given to corns as they keep growing back, however they do not possess roots to grow back from.
Corns originate from pressure and a proficient podiatric doctor could easily remove a corn. The problem is that after the corn is taken away if the pressure which caused it is still there then, obviously, it will come back. It develops back because the cause is still there and not because the podiatrist left a root there for the corn to grow back from. That pressure could be from poor fitting footwear or from something similar to a mallet toe or hallux valgus which leads to greater pressure on an area. If the corn is beneath the foot, then the cause is elevated pressure on the spot where the corn is, probably because of the way you walk.
The misconception remains since they do come back, so its necessary to remove the cause at the same time the corn is taken off. There isn't any root to be removed. This means that the pressure over the foot the location where the corn had been needs to be decreased or removed. This can involve issues like using better fitting footwear or the use of padding to get pressure off the location where the corn is. Sometimes surgery will be required to the bone beneath the corn to remove the pressure. If that cause isn't removed or decreased then the corn will come back, therefore it is easy to understand where the myth about corn roots derives from.