#callus.scar_tissue  bony tissue formed during the healing of a fractured bone
  supertype:  #scar_tissue__scar__cicatrix__cicatrice  a mark left by the healing of injured tissue
  subtype:  #chestnut.callus  a small horny callus on the inner surface of a horse's leg

No statement uses or specializes #callus.scar_tissue; click here to add one.