POROKERATOSIS TYPES (or Lesions with Ridges)

By Gary M. White, MD

Porokeratosis is a keratinizing disorder characterized by spreading round atrophic rings with a raised ridge as a border corresponding histologically to the cornoid lamella.

Clinical Variants of Porokeratosis

Disseminated Superficial Actinic Porokeratosis

Eruptive Disseminated Porokeratosis

Linear Porokeratosis

Giant Porokeratosis: Large atrophic lesions with a ridged border and spanning 10-20 cm in diameter are characteristic. There is a risk of malignant change (e.g., Bowen's disease [Derm 1994;189;782]). [HT 1990;41;633].

Porokeratosis Palmaris Plantaris et Disseminata

Porokeratosis of Mibelli

Genital Porokeratosis (involves the penis, scrotum, or vulvar areas)

Porokeratosis ptychotropica (porokeratosis of the perianal and gluteal regions) [JAMA Derm 2014;150;1007].

86-year-old man with a verrucous form from Acta Dermato-Venereologica 2015;95;241


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