Pityriasis Rosea
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Basics
Description
- A self-limited skin exanthem of unknown origin primarily affecting children and young adults
- Skin findings often begin with an isolated “herald patch,” an ovoid erythematous raised lesion seen along the trunk and extremities
- A secondary eruption usually follows, where multiple smaller exanthems appear along the Langer lines of the trunk and proximal extremities in a symmetric “Christmas-tree pattern”
- Nearly 80% of symptoms resolve within 2 mo
- 20% of patients will present with an atypical presentation
Etiology
- Unknown, although there is weak evidence for a viral etiology such as herpes 6 and 7
- Many medications have been associated with a pityriasis-like reaction:
- Barbiturates
- Captopril
- Clonidine
- Gold
- Isotretinoin
- Metronidazole
- Bismuth
- Hepatitis B vaccine
- Gleevec
- Interferon
- Eczema, asthma, and underlying malignancies may be weakly associated
-- To view the remaining sections of this topic, please log in or purchase a subscription --
Basics
Description
- A self-limited skin exanthem of unknown origin primarily affecting children and young adults
- Skin findings often begin with an isolated “herald patch,” an ovoid erythematous raised lesion seen along the trunk and extremities
- A secondary eruption usually follows, where multiple smaller exanthems appear along the Langer lines of the trunk and proximal extremities in a symmetric “Christmas-tree pattern”
- Nearly 80% of symptoms resolve within 2 mo
- 20% of patients will present with an atypical presentation
Etiology
- Unknown, although there is weak evidence for a viral etiology such as herpes 6 and 7
- Many medications have been associated with a pityriasis-like reaction:
- Barbiturates
- Captopril
- Clonidine
- Gold
- Isotretinoin
- Metronidazole
- Bismuth
- Hepatitis B vaccine
- Gleevec
- Interferon
- Eczema, asthma, and underlying malignancies may be weakly associated
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