Hard skin removal
A podiatrist may cut away some of the thickened skin using a sharp blade called a scalpel. This helps to relieve pressure on the tissue underneath.
Don't try to cut the corn or callus yourself. You could make it more painful and it might become infected. You can use a pumice stone or foot file to rub down skin that's getting thick.
Information from NHS Choices, available online at http://www.nhs.uk/Conditions/CornsandCalluses/Pages/Treatment.aspx