title: Squamous cell carcinoma in lichen planopilaris.
abstract: BACKGROUND
  Lichen planopilaris (LPP) is a rare variant of cutaneous lichen planus that preferentially involves hair follicles.
  
  
  METHODS
  We describe the case of an 87-year-old woman with cicatricial alopecia due to lichen planopilaris. The diagnosis was based on clinical evaluation, histopathology and trichoscopy. Squamous cell carcinoma developed within the hairless area after 18 years of evolution.
  
  
  CONCLUSIONS
  It is necessary to consider the association between lichen planopilaris and squamous cell carcinoma and to ensure a close follow-up of LPP patients, especially when there is a long history of the disease or new a lesion develops, which does not correspond clinically or in trichoscopy to lichen planopilaris.
authors.affiliation: Dermatology Service, Hospital Virgen de Las Nieves, Granada, Spain;
authors.forename: Cristina
authors.initials: C
authors.lastname: Garrido Colmenero
authors.forename: Aurelio
authors.initials: A
authors.lastname: Martín Castro
authors.forename: Ignacio
authors.initials: I
authors.lastname: Valenzuela Salas
authors.forename: Eliseo
authors.initials: E
authors.lastname: Martínez García
authors.forename: Gonzalo
authors.initials: G
authors.lastname: Blasco Morente
authors.forename: Jesús
authors.initials: J
authors.lastname: Tercedor Sánchez
keywords: cicatricial alopecia; lichen planopilaris; squamous cell carcinoma