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Atypical cases of pityriasis rosea (PR) are fairly common and less readily recognized than typical eruptions. We present four patients for whom we believe atypical PR is the most likely diagnosis. A 33-year-old man had purpuric lesions bilaterally on the legs with classical rash on the trunk. A 28-year-old woman had intensely pruritic and urticarial(More)
No criteria exist for the modern diagnosis of Gianotti-Crosti syndrome (GCS). Our study objectives were to determine diagnostic criteria for GCS and to assess their validity using a prospective case-control design. We reviewed the clinical features of children with GCS who were reported in the literature from 1996 to 2000 and proposed a set of diagnostic(More)
Eruptive pseudoangiomatosis is a distinct exanthem thought to be caused by viruses. The usual rash configu-ration is erythematous papules and macules. An association with echovirus infection has been reported. We present here one adult and one child with this exanthem, supported by clinical, histopathological, and immunohistochemical findings. Both patients(More)
BACKGROUND Conflicting results on the association of pityriasis rosea and human herpesvirus 7 infection have been reported by different investigators. AIM To review the level of evidence for such an association. METHODS Medline was searched with unlimited data entry and 13 reports were retrieved. The data were analyzed for a causative association(More)
BACKGROUND Data are lacking on the prevalence of acne, its effects on quality of life (QOL) and the treatment usage among Chinese patients in late adolescence. AIM To derive data about the prevalence and predictive factors of acne, the disability caused by acne and choice of treatment used by Chinese late adolescents in Hong Kong. METHODS This was a(More)
OBJECTIVE To detect temporal case clustering in patients with pityriasis rosea in different geographic locations. DESIGN Regression analysis of dates on which 1379 patients were diagnosed as having pityriasis rosea in 3 different geographic locations. The control data consisted of dates of diagnosis of patients with psoriasis in the same settings. (More)
Previous studies on the association of smoking with acne vulgaris have reported conflicting results. The objective of this study was to investigate such an association. Our setting was three primary care practices in Hong Kong and one primary care practice in India. Patient characteristics in all four practices are similar. All medical records in these(More)
OBJECTIVES To investigate the epidemiology of pityriasis rosea in primary care settings in Hong Kong and to analyze for temporal clustering. DESIGN Retrospective epidemiologic study. SETTING Six primary care teaching practices affiliated with a university. Patients Forty-one patients with pityriasis rosea, 564 patients with atopic dermatitis (negative(More)