Disseminated superficial actinic porokeratosis (DSAP) is the most common form of porokeratosis characterized by the presence of several small annular plaques with a distinctive keratotic rim found most commonly on sun-exposed areas of the skin, particularly the extremities.

Pruritus is an itch or a sensation that makes a person want to scratch. This term refers to an abnormally increased disposition to experience pruritus.