DEAR DOCTOR K: I have a patch of hard skin on my foot. Is it a corn or a callus? How should I treat it?
DEAR READER: I can't answer your question without seeing it. But I can tell you what to look for, and when it requires a visit to your doctor. Corns and calluses are areas of hardened skin. They develop to protect the foot from the damage that can be caused by friction from poorly fitting shoes.