Pterygium of the nail

external

• Synonyms

  • Nail cuticle overgrowth

• Causes

  • Lichen planus

• Parents

  • Nail sign

• Description

  • "overgrowth of proximal nail fold onto nail bed. Greek 'pterygion'=�little wing� or �fin.� Forms if there is scar tissue in nail matrix. Nail matrix unable to manufacture nail plate > proximal nail fold grows out with the skin of the nail bed
  • giving rise to the triangular fin."