Pityriasis rosea

A viral rash, sometimes dramatic, can last for months!  Typically young adults. 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. Looks like ringworm, but then:
  • Then multiple smaller scaly oval macules or plaques, typically chest and back – up to 20 days after appearance of herald patch. Classically “pine tree” distribution –  think drooping branches extending out from midline.