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Disorder characterised by an initial ‘herald patch’ followed by scaly erythematous plaques usually in ‘Christmas tree’ distribution

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QUESTION

What disorder is characterised by an initial ‘herald patch’ which is then followed by scaly erythematous plaques usually in a ‘Christmas tree’ distribution?

  1. Pityriasis rosea
  2. Herpes
  3. Varicella zoster virus
  4. Erysipelas
ANSWER
Correct Option: Option A, Pityriasis rosea
Pityriasis rosea classically presents with a salmon coloured solitary patch ‘herald patch’ which enlarges over a few days followed by generalised bilateral and symmetric macules with collarette scale. Pruritus is sometimes present. It self resolves within 6 – 8 weeks.
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