title: A nonrandomized study of trichoscopy patterns using nonpolarized (contact) and polarized (noncontact) dermatoscopy in hair and shaft disorders.
abstract: OBJECTIVE
  The aim was to study the trichoscopy features of selected hair and scalp conditions by two dermoscopic devices with different modes that is, polarized (noncontact) and nonpolarized (contact) mode.
  
  
  METHODS
  The present study included 11 clinical varieties of cases with total 112 patients, attending Sir Takhtasinh Hospital, Bhavnagar in the last 2 years. The clinical history was recorded for each case, and images were taken in both the Heine and DermLite II pro dermatoscope. We used polarized mode of the noncontact device (DermLite II) and the nonpolarized mode of the contact device (Heine) for our study.
  
  
  METHODS
  Fisher's exact test to study dermoscopic observations for each mode.
  
  
  RESULTS
  We observed different nonscarring alopecia cases such as alopecia areata, androgenetic alopecia, trichotillomania, and tinea capitis. Scarring alopecia included discoid lupus erythematosus, lichen planopilaris, pseudopelade of Brocq, systemic lupus erythematosus. Scaling disorders included the psoriasis and seborrheic dermatitis. Furthermore, infestations like pediculosis capitis were included in the study. Various features were divided into follicular, interfollicular, pigmentary, vascular and hair shaft patterns. Each of the features was correlated in both the Heine (nonpolarized) and DermLite II (polarized) dermoscope, and observational finding was put forward accordingly.
  
  
  CONCLUSIONS
  Various variations were observed in the documentation of dermoscopic patterns of the two dermatoscopes with certain features such as vascular patterns, scaling, and reticular pigmentation being better appreciated in polarized mode, while certain features were better documented in nonpolarized mode that is, black dots and tapered hair.
authors.affiliation: Department of Dermatology, Venereology and Leprosy, Government Medical College Bhavnagar, Sir Takhtasinh General Hospital Campus, Bhavnagar, Gujarat, India.
authors.forename: Vivek V
authors.initials: VV
authors.lastname: Nikam
authors.affiliation: Department of Dermatology, Venereology and Leprosy, Government Medical College Bhavnagar, Sir Takhtasinh General Hospital Campus, Bhavnagar, Gujarat, India.
authors.forename: Hita H
authors.initials: HH
authors.lastname: Mehta
keywords: Nonpolarized dermoscopy; polarized; trichoscopy