Parapsoriasis https://en.wikipedia.org/wiki/Parapsoriasis
Parapsoriasis bezitt sech op ee vun enger Grupp vu Hautkrankheeten, déi sech haaptsächlech duerch hir Ähnlechkeet mat Psoriasis charakteriséiert (rout, schaferesch Läsionen). Parapsoriasis ass eng selten Haut‑lymphoproliferativ Dermatose déi haaptsächlech bei mëttelalterleche Erwuessener optrieden, 2/3 vun deenen männlech sinn.

Hautkrebs (skin cancer) kann aus Parapsoriasis entwéckelt ginn. Zum Beispill kann et zu kutanes T‑Zell‑Lymphom (cutaneous T‑cell lymphoma) entwéckelen.

○ Diagnos a Behandlung
Blutt‑Tester (blood tests) fir Syphilis auszeschléissen
Biopsie fir kutanes Lymphom (cutaneous lymphoma) auszeschléissen

Méi Informatiounen ― Lëtzebuergesch
References Parapsoriasis-A Diagnosis with an Identity Crisis: A Narrative Review 35426607 
NIH
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.
 Histopathologic Evaluation of Parapsoriasis from the Perspective of NB-UVB/PUVA Therapy on the Outcome and Recurrence of the Disease 33911303 
NIH
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.