The document discusses various common and uncommon nail, corn, and callus problems of the foot. It addresses topics such as: 1) The definition and treatment of common corns, including when to stop cutting them and how to prevent recurrence. 2) Distinguishing corns from other conditions like hammer toes that present similarly but require different treatment. 3) Uncommon conditions like Charcot foot deformity and intractable plantar keratosis that result from neuropathy or structural abnormalities. 4) Nail problems in diabetics or due to fungus, and treatments ranging from thinning the nail to surgical removal or matrixectomy for ingrown nails.