• redness
  • Erythema (from the Greek erythros, meaning red) is redness of the skin or mucous membranes, caused by hyperemia (increased blood flow) in superficial capillaries. (wikipedia.org)
  • found
  • Research in Europe had found that erythema migrans and acrodermatitis chronica atrophicans, another rash caused by ticks in Europe, responded to penicillin, suggesting that the cause was bacterial, not viral. (wikipedia.org)