Parapsoriasis Explained

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]

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.^[2] However, the following classification scheme is now generally accepted:^[3]

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

See also

• Mycosis Fungoides
• Poikiloderma vasculare atrophicans
• List of cutaneous conditions

Notes and References

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