A localized, cone-shaped area of hyperkeratosis caused by pressure, with a hard central core, unlike the diffuse thickening of tylosis.
A general term for thickened skin on palms and soles; tylosis is a specific inherited form, but this could also refer to acquired forms with an underlying cause (e.g., malignancy).
A bacterial infection causing malodorous, superficial pits on the plantar surface, not diffuse thickening.
