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Ring rash

  • Common ddx

    • ringworm (kids)
    • Lyme disease (target shape)
    • erythema multiforme (urticarial)
      • drug reaction (recent antibiotics)
      • infection
    • porokeratosis (dry, scaley)
  • Serious ddx

    • SJS (mucosal involvement, Nikolsky sign)
  • Labs

    • wood's lamp
    • CBC, ESR
    • Lyme titer if target rash or hx of tick bite

  • Print | Citations

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