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Lymphomatoid papulosis lesions with ulceration and crusting

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.

Neoplasms can develop from parapsoriasis.[1] For example, it can develop into cutaneous T-cell lymphoma.

The word "parapsoriasis" was formed in 1902.[2]


The parapsoriasis groups, described and debated for nearly a century, has spawned a confusing nomenclature. There are some authors who prefer to limit the term "parapsoriasis" to large- and small-plaque variants only.[2] However, the following classification scheme is now generally accepted:[3]: 450 

See also


  1. Sehgal VN, Srivastava G, Aggarwal AK (2007). "Parapsoriasis: a complex issue". Skinmed. 6 (6): 280–6. doi:10.1111/j.1540-9740.2007.06490.x. PMID 17975354.
  2. 2.0 2.1 Lambert WC, Everett MA (Oct 1981). "The nosology of parapsoriasis". J. Am. Acad. Dermatol. 5 (4): 373–95. doi:10.1016/S0190-9622(81)70100-2. PMID 7026622.
  3. Freedberg, et al. (2003). Fitzpatrick's Dermatology in General Medicine. (6th ed.). McGraw-Hill. ISBN 0-07-138076-0.

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