Identity Profile: Corns

Definition:   A hard, conical projection of a brownish-yellow color that is either straight or curved, protruding from the skin, is due to an excessive growth of keratin (hyperkeratosis). It gets its name from its resemblance to an animal's horn. These skin outgrowths typically develop in areas frequently exposed to the sun, most often on the face, ears, and back of the hand. In about 60% of cases, these cutaneous horns are benign, but they can also be cancerous or precancerous.

Internal and external causes:   Often unknown; presence of viral warts caused by the human papillomavirus; exposure to sunlight; skin cancer; precancerous skin lesions.

How to reduce or eliminate them:   Never attempt to remove a skin corn by yourself; consult a doctor; complete removal of the skin corn when malignancy is a major concern; laser therapy; electrocautery; freezing with liquid nitrogen.

Preventive measures:   There are no clear preventive measures; avoid sun exposure; apply a broad-spectrum, high-protection sunscreen daily.