Which physical findings are characteristic of linear porokeratosis?

Updated: Oct 09, 2020
  • Author: Amarateedha Prak LeCourt, MD; Chief Editor: William D James, MD  more...
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Grouped, linearly arranged, annular papules and plaques with the characteristic raised peripheral ridge are seen unilaterally on an extremity, the trunk, and/or the head and neck area. The lesions commonly follow a dermatomal or blaschkoid distribution, and they may arise initially as reddish-brown patches.

Multiple linear groups may be seen in one patient. They may be seen in association with other forms of porokeratosis. Individual lesions within the linear grouping have a well-developed border, often with a central furrow similar to that seen in classic porokeratosis of Mibelli (PM).

Clinical changes consistent with the development of a basal or squamous cell carcinoma are more common in linear porokeratosis than in other forms of porokeratosis.

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