Corns can form anywhere on the foot, these result from increased pressure or rubbing to an area. There are different types of corns that are dependant on the area and reason for them growing.
The bodies response to this increased pressure or rubbing is to lay down more hard skin protein (Keratin). Keratin is extremely dense and is compressed by constantly standing on the corn.
The corn forms in a cylindrical plug kind of like an ice cream cone shape. The sharp ‘tip’ or what some people refer to as the ‘seed’ or ‘core’ of the corn presses into the soft skin deep to it and causes the sharp pain you are experiencing.
It is usually very painful, and commonly found on the highest weight bearing areas of the foot, interdigitally (between the toes) or in areas of high friction eg tops of toes.
Treatment involves debridement of the overlying callus and ‘enucleating’ or scooping out the nucleus. This is usually painless.
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