Corns are concentrated areas of callous, there are different types of corns;

• Hard Corns
  These tend to form over bony prominences which are under excessive pressure. Usual sites for this type of corn are: The metetarsals 1-5 The outside of the little toe The tops of the toes The tip of the toes
  
• Soft Corns
  These usually appear in between the toes. They are often surrounded by white macerated tissue.
  
• Seed Corns
  These corns are small and often associated with dry skin.