Corns are a common disorder affecting the foot. They are a natural response 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's a consistent myth that corns have roots which they carry on growing back from whenever you try to take them off. This is just like the analogy of plants which grow back from their roots if you cut the top of the plants off. That analogy has been given to corns since they keep growing back again, however they do not possess roots to grow back from.
Corns originate from pressure and a experienced podiatrist can 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 is going to grow back. It comes back simply because the cause remains and not because the podiatrist left a root there for the corn to develop back from. That pressure could be from a poor fitting shoe or from something like a hammer toe or bunion leading 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, most likely due to the way you walk.
The misconception remains simply because they do return, so its essential to remove the cause when the corn is taken off. There is absolutely no root to be removed. This means that the pressure on the foot the location where the corn has been really needs to be reduced or removed. This will involve issues like using better fitting shoes or the use of padding to get pressure off the location where the corn is. Sometimes surgery is going to be necessary to the bone under the corn to get rid of the pressure. If that cause is not eliminated or reduced then the corn will return, so it will be easy to see where the myth regarding corn roots comes from.