Other Scenarios...

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Other Scenarios...

Again, patient history may be quite helpful in identifying or ruling out arthropods.
  • Travelers from other parts of the world may be harboring arthropods of medical importance that are not usually seen in the US.
Or... non-arthropod causes of itch and rash as in:
  • The case where the human is an accidental host, such as in "swimmer's itch" might be the actual cause of itching. A rash develops, but the rash is not due to an arthropod. (Called cercarial dermatitis or Schistosome dermatitis.)
  • Eczema, contact dermatitis, psoriasis
  • Folliculitis (frequently caused by staphylococci or pseudomonads)
23. CDC. Image# 3383. "This illustration depicts the life cycle of those parasites that are responsible for the skin condition known as cercarial dermatitis, also known as swimmer’s itch. These parasites are members of the family of water-borne trematodes known as Schistosomatidae." PHIL public domain. Created 2001. https://phil.cdc.gov/Details.aspx?pid=3383

Swimmer's itch life cycle (cercarial dermatitis caused by water-borne trematodes, Schistosomatidae). (23)