Parapsoriasis fait référence à un groupe de troubles cutanés caractérisés surtout par leur ressemblance avec le psoriasis (lésions rouges et squameuses). Le parapsoriasis est une dermatose lymphoproliférative cutanée rare qui survient principalement chez les adultes d’âge moyen, dont les deux tiers sont des hommes.
Un cancer cutané peut se développer à partir d’un parapsoriasis. Par exemple, il peut évoluer en lymphome cutané à cellules T.
○ Diagnostic et traitement Des tests sanguins pour exclure la syphilis. Biopsie pour exclure les lymphomes cutanés.
Parapsoriasis refers to one of a group of skin disorders that are characterized primarily by their resemblance to psoriasis (red, scaly lesions), rather than by their underlying cause.
Parapsoriasis is an uncommon inflammatory skin disease characterized by chronic patches that may be resistant to therapy. It was primarily introduced and classified 120 years ago, and the original classification incorporated parapsoriasis and pityriasis lichenoides under the umbrella term parapsoriasis. After a major change in classification, parapsoriasis now exclusively refers to small plaque parapsoriasis (SPP) and large plaque parapsoriasis (LPP). However, debates still frequently occur regarding various nomenclatures and classifications used by different authors. Moreover, parapsoriasis may progress to overt cutaneous lymphoma, most commonly mycosis fungoides (MF), and it is very difficult to distinguish these two conditions despite modern histologic and molecular testing techniques.
Parapsoriasis, presented as an early stage of cutaneous T-cell lymphoma, is mostly treated with psoralen and ultraviolet A (PUVA) therapy and narrowband ultraviolet B (NB-UVB) phototherapy.
Un cancer cutané peut se développer à partir d’un parapsoriasis. Par exemple, il peut évoluer en lymphome cutané à cellules T.
○ Diagnostic et traitement
Des tests sanguins pour exclure la syphilis.
Biopsie pour exclure les lymphomes cutanés.