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{{Infobox disease

| Name           = Pityriasis rosea

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Diagnosis

Experienced doctors may make the diagnosis clinically. If the diagnosis is in doubt, tests may be performed to rule out similar conditions such as ringworm, guttate psoriasis, nummular or discoid eczema, drug eruptions, other viral exanthems, and especially secondary syphilis. A biopsy of the lesions will show extravasated erythrocytes within dermal papillae and dyskeratotic cells within the dermis.

Treatment

No treatment is usually required.

Oral antihistamines or topical steroids may be used to decrease itching. Steroids do provide relief from itching, and improve the appearance of the rash, but they also cause the new skin that forms (after the rash subsides) to take longer to match the surrounding skin color. While no scarring has been found to be associated with the rash, itching and scratching should be avoided. Irritants such as soap should be avoided, too; a soap containing moisturizers (such as goat's milk) may be used, however, any generic moisturizer can help to manage over-dryness.

Direct sunlight makes the lesions resolve more quickly. According to this principle, medical treatment with ultraviolet light has been used to hasten resolution, though studies disagree whether it decreases itching or not. UV therapy is most beneficial in the first week of the eruption.

Prognosis

In most patients, the condition lasts only a matter of weeks; in some cases it can last longer (up to six months). The disease resolves completely without long-term effects. Two percent of patients have recurrence.

Epidemiology

The overall prevalence of PR in the United States has been estimated to be 0.13% in men and 0.14% in women. It most commonly occurs between the ages of 10 and 35. It is more common in winter.

See also

• Pityriasis circinata - a localized form of pityriasis rosea that affects the axillae and groin
• Pityriasis - for list of similarly named flaky skin conditions

References

1. ^ Habif, Thomas P (2004), Clinical Dermatology: A Clinical Guide to Diagnosis and Therapy (4th ed.), Mosby, pp. 246–8, ISBN 0-323-01319-8
2. Horn T, Kazakis A (1987). "Pityriasis rosea and the need for a serologic test for syphilis". Cutis. 39: 81.
3. ^ Arndt, KA (1983). "Treatment of pityriasis rosea with UV radiation". Arch Dermatol. 119: 381.
4. Leenutaphong V, Jiamton S (1995). "UVB phototherapy for pityriasis rosea: a bilateral compatison study". J Am Acad Dermatol. 33 (6): 996.
5. Kempf, W; et al. (1999). "Pityriasis rosea is not associated with Human herpesvirus 7". Arch Dermatol. 135 (9): 1070. {{cite journal}}: Explicit use of et al. in: |last2= (help)
6. Chuang, T-Y; et al. (1982). "Pityriasis rosea in Rochester, Minnesota, 1969 to 1978: a 10-year epidemiologic study". J Am Acad Dermatol. 7: 80. {{cite journal}}: Explicit use of et al. in: |last2= (help)

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External links

• American Academy of Dermatology - Pityriasis Rosea
• eMedicine.com - Pityriasis Rosea
• WebMD.com - Pityriasis Rosea
• HealthInPlainEnglish - Pityriasis rosea
• DermNet viral/pityriasis-rosea

• http://www.aocd.org/skin/dermatologic_diseases/pityriasis_rosea.html Pityriasis Rosea overview
• Links to pityriasis rosea pictures (Hardin MD/Univ of Iowa)
• Go Ask Alice Health Advice from Columbia University
• American Osteopathic College of Dermatology

• Papulosquamous hyperkeratotic skin diseases
• Ailments of unknown etiology