title: Dermoscopy in pigmented squamous cell carcinoma.
abstract: BACKGROUND
  The diagnosis of squamous cell carcinoma (SCC) is, generally, a clinical diagnosis, but in some cases, when the lesion is pigmented, as in our case, the differential diagnosis between pigmented SCC and other pigmented skin lesions, in particular melanocytic lesions, is difficult. Dermoscopy may improve the early diagnosis of SCC and thus play a role in its preoperative classification. However, its potential role has been hampered so far by the fact that little is known about the dermoscopic features of pigmented SCC.
  
  
  OBJECTIVE
  We report the case of a rare pigmented SCC dermoscopically mimicking a melanocytic lesion whose dermoscopic features have been investigated.
  
  
  CONCLUSIONS
  On the basis of the literature and our experience, pigmented SCC can present dermoscopic features typical of melanocytic lesions, such as radial streaks, globules, and homogeneous blue pigmentation, and can lead dermatologists to diagnostic errors.
authors.affiliation: Departments of Dermatology and Human Pathology and Oncology, University of Florence, Florence, Italy. vincenzo.degiorgi@unifi.it
authors.forename: Vincenzo
authors.initials: V
authors.lastname: de Giorgi
authors.forename: Barbara
authors.initials: B
authors.lastname: Alfaioli
authors.forename: Federica
authors.initials: F
authors.lastname: Papi
authors.forename: Agata
authors.initials: A
authors.lastname: Janowska
authors.forename: Marta
authors.initials: M
authors.lastname: Grazzini
authors.forename: Torello
authors.initials: T
authors.lastname: Lotti
authors.forename: Daniela
authors.initials: D
authors.lastname: Massi
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D046169:Dermoscopy; D003937:Diagnosis, Differential; D005145:Face; D005260:Female; D006801:Humans; D008875:Middle Aged; D012878:Skin Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery