Race
Frequency
Sex
Age
PM and porokeratosis palmaris et plantaris disseminata (PPPD) affect men twice as often as women. DSAP is twice as likely to develop in women compared with men. Linear porokeratosis is seen with equal incidence in men and women.
Disseminated superficial actinic porokeratosis (DSAP) and porokeratosis of Mibelli (PM) are the most commonly seen variants. The other forms of porokeratosis are rare.
Porokeratosis most commonly occurs in fair-skinned individuals. Porokeratosis is rare in darker- skinned populations.
PPPD and linear porokeratosis may be seen at any age, from birth to adulthood. PM usually develops in childhood. Disseminated superficial porokeratosis (DSP) generally develops in the third or fourth decade of life.
