Parapsoriasis

Parapsoriasis
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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.<ref name="pmid-17975354">,

 Parapsoriasis: a complex issue, 
 Skinmed, 
 2007,
 Vol. 6(Issue: 6),
 pp. 280–6,
 DOI: 10.1111/j.1540-9740.2007.06490.x,
 PMID: 17975354,</ref> For example, it can develop into cutaneous T-cell lymphoma.

The word "parapsoriasis" was formed in 1902.<ref name=parap81>,

 The nosology of parapsoriasis, 
 J. Am. Acad. Dermatol., 
 
 Vol. 5(Issue: 4),
 pp. 373–95,
 DOI: 10.1016/S0190-9622(81)70100-2,
 PMID: 7026622,</ref>

Classification

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.<ref name=parap81/> However, the following classification scheme is now generally accepted:<ref name="Fitz2">Freedberg, et al. (2003). Fitzpatrick's Dermatology in General Medicine. (6th ed.). McGraw-Hill. ISBN 0-07-138076-0.</ref>

• Large-plaque parapsoriasis
• Small-plaque parapsoriasis
• Pityriasis lichenoides
  • Pityriasis lichenoides chronica
  • Pityriasis lichenoides et varioliformis acuta
• Lymphomatoid papulosis

Treatment

• Treatment of small plaque parapsoriasis is unnecessary but can include emollients, topical tar preparations or corticosteroids, and/or phototherapy.
• Treatment of large plaque parapsoriasis is phototherapy or topical corticosteroids.

See also

• Poikiloderma vasculare atrophicans
• List of cutaneous conditions

External links

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