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The natural history of pityriasis rosea in black American children: how correct is the "classic" description?

OBJECTIVES
To delineate the natural history of pityriasis rosea in black children and to compare our findings with those of the American, European, and African literature on pityriasis rosea. Textbook and journal article descriptions of pityriasis rosea usually offer information about the presentation and clinical course of this condition in white patients.


DESIGN
Prospective observational study.


SETTING
The general pediatric clinic, adolescent clinic, and emergency department of Children's Hospital of Michigan, Detroit, from June 2003 through May 2005.


PATIENTS
We followed up 50 black children with pityriasis rosea from the time of diagnosis through follow-up visits at 1, 2, and 4 weeks. Detailed observations were made and digital photographs taken at each visit.


MAIN OUTCOME MEASURES
Duration of illness and pigmentary sequelae.


RESULTS
Similarities with the medical literature were found regarding season of onset and prevalence of pruritus and of a herald patch. Our patients had more frequent facial involvement (30%) and more scalp lesions (8%) than usually described in white populations. One third had papular lesions. The disease resolved in nearly one half of patients within 2 weeks. Residual hyperpigmentation was seen in 48% of patients. Hypopigmentation developed in 29% of patients with purely papular or papulovesicular lesions.


CONCLUSIONS
Pityriasis rosea in black children differs in several ways from textbook descriptions. Physicians may use this information to better counsel patients about the course and potential sequelae of this condition.