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.

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