What is the role of dermoscopy in the diagnosis of porokeratosis?

Updated: Oct 09, 2020
  • Author: Amarateedha Prak LeCourt, MD; Chief Editor: William D James, MD  more...
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Answer

Dermoscopy shows a "white track" structure at the periphery of the lesion, corresponding to the cornoid lamella. Occasionally the white track may be a double white track, with brownish discoloration within the furrow, especially in larger lesions such as porokeratosis of Mibelli (PM). The center may show a white homogeneous area, corresponding to an atrophic epithelium. Red dots, globules, and lines corresponding to enlarged capillary vessels that can be seen through the atrophic epithelium. [69]

The dermatoscopic features of the cornoid lamella can be accentuated using marker ink. This also highlights the presence of hair follicles and acrosyringia, some with keratotic plugs. [70]


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