pityriasis rosea husein oozeerally. pityriasis rosea originally described by camille melchior gibert...
TRANSCRIPT
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Pityriasis Rosea
Husein Oozeerally
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Pityriasis rosea
• Originally described by Camille• Melchior Gibert in 1860
• Pityriasis: fine scales• Rosea: rose coloured or pink• Benign Self limiting but associated with
increased miscarriage in first 15 wks of pregnancy
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Pityriasis Rosea
• 2 % of OP visits • F>M• Children and young adults (10-35yr) • 0.15% prevalence • No racial variation (lesion colour)• Seasonal outbreaks and climatic variation • Institutional outbreaks
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Pityriasis Rosea
• Uncertain cause
• Possible viral trigger– HHV 6 HHV 7– Not contagious
• Life long immunity after outbreak
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Initially….
• Prodromal symptoms– Malaise – Headache– Mild constitutional symptoms– Respiratory infection in 69%
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Then..
• “Herald patch”– Large (2 - 10cm) – Isolated– Single or multiple– Oval– Pink– Scaly– Central clearing occasionally (mimic tinea)
• Cluster of small oval spots (mimic acne)• Location abdomen (occn armpit)
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Images
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5 to 10 days later
• Smaller lesion appear on the body
• Trunk (sometimes thighs)
• Occasionally on face, palms and soles– African american boys– Termed inverse pityriasis
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Progression
• Small round papules
• > enlarge to1-2cm ovals
• Scaly surface
• Raised or flat
• Hyper or hypo pigmented
• Run along dermatomal lines/ribs giving Christmas tree distribution
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4 to 6 weeks
• Begins to fade
• Lasts average 2 - 3 months
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Differential
• Viral Exanthems
• Measle like drug eruptions
• Secondary syphilis
• Tinea (KOH test negative)
• Guttate psoriasis
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Diagnosis
• Experienced Clinician!!!
• A biopsy of lesion show erthrocytes with dermal papillae and dyskeratotic cells within the dermis
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Management
No treatment but…….
Symptom relief from itching
Avoided soap
Oral erythromycin
UVB light (used in the first week)may hasten the disappearance
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The END
• Summary– Common– Benign – Self limiting (no tx)
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References
• Atlas of Pedistric Physical Diagnosis Zitelli 5 ed
• Emedicine Medscape www