A callus is a thickening of the skin that typically develops on the underside on the foot (particularly at the heel or ball of the foot), and is caused by prolonged rubbing against the inside of shoes. They can also be caused by walking or foot abnormalities that place improper stress on various parts of the foot.
Similar to a callus, a corn is a thickening of the skin caused by friction and pressure from shoes, or abnormal walking patterns. However, corns are generally smaller and usually develop on non-weight bearing parts of the foot, such on the toes or between them. Calluses also have a hard center surrounded by inflamed skin.
If self-care remedies, such as soaking your foot and switching shoes, are not effective, medical attention should be sought. However, anyone who is diabetic should not attempt self-treatment and should seek immediate medical care. When not treated properly, even a minor foot issue can lead to an infected open sore (ulcer) in those who suffer from diabetes.
Specific treatment will depend on the location, size and severity of pain being caused by the corn or callus. Among the available treatment options are: