Due to high stress or improper footwear, there can be an increased formation of horn cells, known as hyperkeratosis. Calluses can be easily recognized by a yellowish tint in the skin at that spot. As a result, this leads to unsightly skin patches, painful thickening of the callus, and postural issues due to compensatory movements. The fine side smooths the skin, making it even softer and more well-groomed. The handle of the file fits comfortably in the hand. The Scholl callus file should be used on dry and clean skin. It is washable.