Hard, dry masses of yellowish or greyish skin on the plantar surface, often surrounded by a red, inflamed rim that is swollen and painful. Excessive pressure onthe weight-bearing segments of the foot. Microtrauma due to hypermobility associated with excessive pronation. Although calluses can be removed, they will return unless weight distribution is balanced by orthotics. The distal joints of the smaller toes bend down, while the proximal joints bend up.
Corns form where they bend up.
Also need to treat the associated corns. Usually between the 3rd and 4th toes.