Due to high stress or improper footwear, there can be increased formation of calluses, known as hyperkeratosis. Calluses are easily recognized by the yellowish tint of the skin in the affected area. As a result, unsightly patches of skin, painful thickening of the callus, and postural issues due to compensatory movements can occur. The fine side smooths the skin, leaving it even more delicate and well-groomed. The file's handle fits comfortably in the hand. The Scholl callus file should be used on dry, clean skin. It is washable.