undifferentiated tissue formed by the cambium. carbon. hydrogen. and oxygen in a proportion of usually as the result of wounding (contrast with woundwood).

Merriam-Webster Online Dictionary
callus (noun)
a thickening of or a hard thickened area on skin or bark
a mass of exudate and connective tissue that forms around a break in a bone and is converted into bone in healing
soft tissue that forms over a wounded or cut plant surface
callus (verb)
intransitive verb
transitive verb
to form callus to cause callus to form on
callus (Wikipedia)
Evolucion de un callo.jpg
Examples of callus found on the toe
ComplicationsSkin ulceration, infection
Calluses (plantar in left foot and lateral in right foot)

A callus is an area of thickened skin that forms as a response to repeated friction, pressure, or other irritation. Since repeated contact is required, calluses are most often found on feet because of frequent walking and poorly fitting footwear. While they can be perceived as being unsightly, calluses are generally not harmful, but if neglected for long periods may sometimes lead to other problems, such as a skin ulceration or infection, or cause the sufferer to try and offload the affected painful area, which can place excessive stress on the asymptomatic side. Rubbing that is too frequent or forceful will cause blisters as opposed to calluses to form.

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