Arthropod bites

    Article Contributors: 
    Sean Klepper M.D.
    Stephen Lyle, M.D., ...

    Clinical Features:

    • The majority of arthropod bites are clinically insignificant.  Serious reactions can result, however, from the bites of the black widow and brown recluse spiders.
    • The reaction to the bite can range from a minor erythematous papule to a large nodule with ulceration and/or vesicle formation.

    Histologic Features:

    • Wedge-shaped mixed dermal inflammatory infiltrate composed of lymphocytes, histiocytes eosinophils and sometimes neutrophils
    • Spongiosis
    • Dermal edema
    • Excoriated lesions may have ulceration and/or a scale crust.
    • Arthropod mouth parts may be seen in the center of the lesion.
    • Spider bites often show extensive necrosis and suppurative inflammation, sometimes extending into the subcutaneous fat and soft tissues, and vasculitis may be present.
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    Cases associated with this book:

  • Arthropod bite
    Author: Stephen Lyle, M.D., Ph.D.

    Conference: DermatopathologyConsultations.com Teaching Collection
  • Arthropod bite
    Author: Stephen Lyle, M.D., Ph.D.

    Conference: DermatopathologyConsultations.com Teaching Collection