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Pityriasis Rosea

Signs & Symptoms

 Itching
Ref: Uptodate [ Pityriasis rosea] Epocrates [ https://online.epocrates.com/diseases/27933/Pityriasis-rosea/History-Exam]
Oval lesions proximal areas of the extremities
Note: Similar in appearance to the herald patch, but smaller
Ref: Uptodate [ Pityriasis rosea]
V distribution over the upper back
Ref: Epocrates [ https://online.epocrates.com/diseases/27933/Pityriasis-rosea/History-Exam]
V distribution horizontal over the lower trunk
Ref: Epocrates [ https://online.epocrates.com/diseases/27933/Pityriasis-rosea/History-Exam]

Physical Examination

 Single oval sharply delimited pink lesion on the back
Note: herald patch is usually 2 to 5 cm in diameter
Ref: Uptodate [ Pityriasis rosea]
Single oval sharply delimited salmon-colored lesion on the back
Note: herald patch is usually 2 to 5 cm in diameter
Ref: Uptodate [ Pityriasis rosea]
Single round sharply delimited pink lesion on the back
Note: herald patch is usually 2 to 5 cm in diameter
Ref: Uptodate [ Pityriasis rosea]

Lab / Serology

 Spores and hyphae on KOH prep (negative symptom)
Ref: Epocrates [ https://online.epocrates.com/diseases/27935/Pityriasis-rosea/Differential-Diagnosis]
Superficial perivascular lymphohistiocytic infiltrate with focal spongiosis
Ref: Epocrates [ https://online.epocrates.com/diseases/27933/Pityriasis-rosea/History-Exam]
drug eruption-increased dermal eosinophils (negative symptom)
Ref: Epocrates [ https://online.epocrates.com/diseases/27935/Pityriasis-rosea/Differential-Diagnosis]

Imagin Study

Complication

Risk Factors

 10 < age < 35
Ref: Epocrates [ https://online.epocrates.com/diseases/27932/Pityriasis-rosea/Risk-Factors]
Female
Ref: Epocrates [ https://online.epocrates.com/diseases/27932/Pityriasis-rosea/Risk-Factors]

Cause

Other