title: [Pityriasis Lichenoides: Case report and review of the literature].
abstract: BACKGROUND
  Pityriasis lichenoides is a benign inflammatory disease of unknown etiology. There are two types of this condition: an acute form (PLEVA = pityriasis lichenoides et varioliformis acuta) and a chronic one (PLC = pityriasis lichenoid chronica). Both are more common in children and young adults.
  
  
  OBJECTIVE
  To describe a case of PLC, discuss its clinical presentation, diagnosis, treatment and present a review of the literature.
  
  
  METHODS
  A seven-year-old child who presented with recurrent oligosymptomatic episodes of bright erythematous papular lesions in centripetal distribution, which subsided and left behind hypopigmented macules. The biopsy of the lesions confirmed chronic pityriasis lichenoid. During the 3 years of follow-up, multiple treatment regimens were used to reduce exacerbations, resulting in a partial response.
  
  
  CONCLUSIONS
  PLC is a rare disease that represents a diagnostic and therapeutic challenge to the physician. The diagnosis of this condition is suspected clinically and confirmed by histology. It does not have specific treatment, but it responds well to corticosteroids, antibiotics, immunosuppressants and phototherapy with UVB narrowband (UVBnb). The latter has given the best results. It is important to monitor patients for risk of developing lymphoproliferative disorders.
authors.affiliation: Departamento de Dermatología, P. Universidad Católica de Chile.
authors.forename: María Soledad T
authors.initials: MS
authors.lastname: Zegpi
authors.affiliation: Médico Cirujano, Servicio de Salud Metropolitano Sur, Chile. Electronic address: feliperuizm@gmail.com.
authors.forename: Felipe M
authors.initials: FM
authors.lastname: Ruiz
authors.affiliation: Residente de Dermatología, P. Universidad Católica de Chile.
authors.forename: Ninoska K
authors.initials: NK
authors.lastname: Porras
mesh_terms: D000305:Adrenal Cortex Hormones / Q000627:therapeutic use; D000359:Aftercare; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D001706:Biopsy; D002648:Child; D002908:Chronic Disease; D006801:Humans; D008297:Male; D017514:Pityriasis Lichenoides / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy; D016896:Treatment Outcome; D014467:Ultraviolet Therapy / Q000379:methods*
chemical_list: D000305:Adrenal Cortex Hormones; D000900:Anti-Bacterial Agents
keywords: Parapsoriasis; Phototherapy; Pitiriasis liquenoide; Pityriasis Lichenoides; fototerapia; parapsoriasis