There are a number of misguided beliefs around the issue of corns on the feet. Corns are a condition connected with there being excessive force on an area of skin. With the foot this higher force could be as a result of toe deformity like hammer toes or hallux valgus in which force from the shoe causes the corn. It can be because of a dropped metatarsal bone, leading to a corn or callus on underneath of the foot. These corns and calluses are a normal response of the skin to an excessive amount of pressure. All that is happening is that the skin thickens up to provide protection to itself. This is a normal and healthy reaction of the skin. Nonetheless, because the pressure that created that thickening remains, the skin will become so thick that it results in being painful. A competent podiatrist could easily eliminate a corn. Its not complicated.
However, after it has been eliminated, it will simply come back again in due course and unless the cause of that greater force isn't removed. This is when the fallacies come into place. Some individuals could accuse the podiatrist of not carrying out their job appropriately, when they quite possibly did, but the corn came back as the pressure, perhaps from inadequately fitting footwear is still there. Other people think corns have roots and the podiatrist failed to take away the root. They think the corn returns because the Podiatrist decided not to get rid of the root (like the plant example, it grows back if its roots are not eradicated). Corns do not have roots. That is the myth. They come back because the cause of will still be there. The best way to eradicate corns forever should be to eliminate the cause. That means the hammer toe or bunion should be fixed, or better fitting shoes used so there is not any force on it or foot orthotics to get force of the dropped metatarsal can be used. If you've got a problem with corns, then discuss with your podiatrist the alternatives to get long term relief.