Lister corns (named after the British surgeon Joseph Lister) are hard, tough corns that form on the inside of the fifth toe. A lister's corn may feel like a blister or a second toenail, and could be caused by rubbing on your shoe. If changing your shoe doesn't help, it could also be caused by a rotated or rolled toe - if this is the case, reach out to our office and schedule a consultation today. Call us today or fill out the online contact form.