What is the prevalence of parapsoriasis?

Updated: Sep 04, 2019
  • Author: Henry K Wong, MD, PhD; Chief Editor: Dirk M Elston, MD  more...
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There are no accurate statistics on the incidence and frequency of parapsoriasis, but digitate dermatoses may be underreported because of the lack of symptoms and subtle presentation. Patients may underreport the frequency of large plaque parapsoriasis when it is asymptomatic and subtle. Thus, the prevalence of large plaque parapsoriasis is not known and may be greater than the reported incidence of mycosis fungoides, which is approximately 3.6 cases per million population per year.

Mortality has not been reported for small plaque parapsoriasis. Morbidity is limited to symptoms, which are minimal. For large plaque parapsoriasis, mortality may be associated with progression to MF (cutaneous T-cell lymphoma [CTCL]). The patch stage of MF represents the early stages of CTCL, and the 5-year survival rate is greater than 90%. Long-term survival is the same as that from a matched controlled population. [13]

Small plaque parapsoriasis is associated with male predominance. The male-to-female ratio is 3:1. A slight asymmetry favoring male dominance for large plaque parapsoriasis may exist.

For both small plaque parapsoriasis and large plaque parapsoriasis, presentation most frequently is in middle age; peak incidence is in the fifth decade of life.

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