Pityriasis rosea

A viral rash, sometimes dramatic, can last for months!  Some characteristic features:

  • Viral illness itself can be trivial
  • Usually not itchy
  • Herald patch – starts with an oval scaly macule, can grow up to 5cm in diameter
  • Then multiple smaller oval macules or plaques, typically chest and back – up to 20 days after appearance of herald patch

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