There are 3 types of corn found on the foot; hard, soft and seed
Hard corns, (heloma durum). These are found in pressure areas and boney prominences. These are painful and can feel like you are walking on a small stone. There is no ‘root’ but the corn is hard skin in a conical shape. Podiatrists can remove these with a scalpel blade and they can be reduced in forming by filing them down and using a good emolient.
Soft corns, (heloma molle). These are found in-between toes and are caused by the adjacent toe bone rubbing against the soft area of the other toe. These can be painful and are difficult to prevent although wearing wider shoes can help. Podiatrists can reduce this type of corn by using a scalpel blade.
Seed corns, (heloma mille). These are found on the bottom of the foot, generally in the heel area. These are caused by friction and shearing forces in the foot. Often these are not painful but if they are, the Podiatrist can remove these using a scalpel blade. These can be helped by using a good emolient.
The picture below shows a toe which had a corn removed from under the corner of the nail. This was a high pressure area and causing a great deal of discomfort. The corn was successfully removed and a small slice of nail taken away to give longer-term relief.