How to use: Before use soak the corn or callus in warm soapy water until it softens. Dry thoroughly. Gently hold the knife against the painful area so that the edge of the blade is in contact with the hard skin, being careful not to apply too much pressure. Carefully shave down the hard skin using slow and gentle strokes to remove very fine layers of dead tissue each time. Continue with gentle strokes taking care not to remove it all in one treatment as this could make the skin sore and tender.