Which clinical history findings are characteristic of classic porokeratosis of Mibelli (PM)?

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

Porokeratosis of Mibelli (PM) is the second most common form of porokeratosis, accounting for about a third of reported cases. [54] It is seen in men more than twice as often as women and may first appear in childhood or young adulthood. PM initially appears as a small, asymptomatic, or slightly pruritic lesion develops that slowly expands over a period of years. Less commonly, lesions may develop during adulthood and enlarge rapidly, usually in the clinical setting of immunosuppression. Occasionally, patients have a history of an antecedent trauma, such as a burn wound.

Most PM lesions reach several centimeters in diameter, although “giant porokeratosis” lesions might grow to 10 cm or 20 cm. [55] Classically, PM lesions are located on an extremities, although they may occur anywhere, including the palms, soles, genitalia, or mucous membranes. [54, 56, 57] The center of the lesion may be slightly hypopigmented or hyperpigmented, minimally scaly, slightly atrophic, and hairless. Occasionally lesions may be confluent thick hyperkeratotic or verrucous plaques. [58, 59]

Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!