parapsoriasismedical dictionary

The term applied to a group of relatively uncommon inflammatory, maculopapular, scaly eruptions of unknown aetiology and resistant to conventional treatment. Eruptions are both psoriatic and lichenoid in appearance, but the diseases are distinct from psoriasis, lichen planus, or other recognised dermatoses. Proposed nomenclature divides parapsoriasis into two distinct subgroups, pityriasis lichenoides and parapsoriasis en plaques (small- and large-plaque parapsoriasis).

(12 Dec 1998)