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A corn, also known as a “heloma” or “focal intractable plantar hyperkeratosis,” is a type of callosity. This latter is a common, uncomfortable thickened skin lesion which results from repeated mechanical trauma due to friction or pressure forces. In the literature, a confusing terminology is often used to call different types of hyperkeratotic skin lesions. Nevertheless, a corn should be distinguished from a callus, which is a more diffuse type of callosity. Thus, a corn is a well-delimited focal area of hyperkeratosis. This condition often is seen in athletes and inpatients who are exposed to unequal friction force from footwear or gait problems, including elderly people, diabetic patients, and amputees.It should be regarded as a symptom rather than an effective disease