#lichen.skin_disease  any of several eruptive skin diseases characterized by hard thick lesions grouped together and resembling lichens growing on rocks
  supertype:  #skin_disease__disease_of_the_skin__skin_disorder__skin_problem__skin_condition  a disease affecting the skin
  subtype:  #lichen_planus__lichen_ruber_planus  an eruption of shiny flat-topped purplish (usually itchy) papules on the wrist and forearms and thighs

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