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  Indian J Med Microbiol
 

Figure 1: (a) Handheld dermoscope with power button (black arrow), polarized and non-polarized knob (yellow arrow), brightness enhancing knob (red arrow), and faceplate of dermoscope (blue arrow). Inset: Illumination system with the circular arrangement of light-emitting diode lamps. (b) Dermoscope is attached to a smartphone by a universal adaptor for quick attach and detach. (c) Clinical image of a hyperpigmented plaque suggestive of hypertrophic lichen planus. (d) Schematic diagram depicting the physics of cross polarization. Source and detector polarizers are placed perpendicularly. Detector polarizer allows nonpolarized absorbed light from the skin surface that has lost its phase or polarization(green arrow) whereas it blocks the reflected polarized light that has retained its phase or polarization (yellow arrow). (e) Dermoscopy of Figure 1c (hypertrophic lichen planus) in nonpolarized mode shows comedone-like opening (red arrows), white scales (blue arrows), and bluish-gray background (yellow arrows). Note the prominence of surface scales and comedo-like openings and ill-visualization of blue color as it is deep in the dermis. (f) Dermoscopy of Figure 1c (hypertrophic lichen planus) in noncontact polarized mode shows better visibility of bluish-white background (yellow arrows), brown pigment globules (green arrows), and white shiny streaks (black arrows). Appreciate the less prominence of comedone-like opening (red arrows) and lesser scales in this image. (g) Dermoscopy of Figure 1c (hypertrophic lichen planus) in contact polarized mode using ultrasound gel as interface medium shows clearer and enhanced visibility of brown pigmented areas (green arrows), white shiny streaks (black arrows) and bluish-gray background (yellow arrows). Comedo-like openings are appearing as brown globules (red arrows) and scales are not visible. (h) Demonstration of the faceplate of dermoscope being 'suspended' in the space of viscous ultrasound gel (black arrow) and by taking support from little finger (red arrow) to avoid pressure effect on the lesion

Figure 1: (a) Handheld dermoscope with power button (black arrow), polarized and non-polarized knob (yellow arrow), brightness enhancing knob (red arrow), and faceplate of dermoscope (blue arrow). Inset: Illumination system with the circular arrangement of light-emitting diode lamps. (b) Dermoscope is attached to a smartphone by a universal adaptor for quick attach and detach. (c) Clinical image of a hyperpigmented plaque suggestive of hypertrophic lichen planus. (d) Schematic diagram depicting the physics of cross polarization. Source and detector polarizers are placed perpendicularly. Detector polarizer allows nonpolarized absorbed light from the skin surface that has lost its phase or polarization(green arrow) whereas it blocks the reflected polarized light that has retained its phase or polarization (yellow arrow). (e) Dermoscopy of Figure 1c (hypertrophic lichen planus) in nonpolarized mode shows comedone-like opening (red arrows), white scales (blue arrows), and bluish-gray background (yellow arrows). Note the prominence of surface scales and comedo-like openings and ill-visualization of blue color as it is deep in the dermis. (f) Dermoscopy of Figure 1c (hypertrophic lichen planus) in noncontact polarized mode shows better visibility of bluish-white background (yellow arrows), brown pigment globules (green arrows), and white shiny streaks (black arrows). Appreciate the less prominence of comedone-like opening (red arrows) and lesser scales in this image. (g) Dermoscopy of Figure 1c (hypertrophic lichen planus) in contact polarized mode using ultrasound gel as interface medium shows clearer and enhanced visibility of brown pigmented areas (green arrows), white shiny streaks (black arrows) and bluish-gray background (yellow arrows). Comedo-like openings are appearing as brown globules (red arrows) and scales are not visible. (h) Demonstration of the faceplate of dermoscope being 'suspended' in the space of viscous ultrasound gel (black arrow) and by taking support from little finger (red arrow) to avoid pressure effect on the lesion