Arthropod | Comments |
Bedbug | Usual reaction is limited to a punctum at the site of the bite. Pruritic red papules, often clustered, are the common allergic response. Reactions may also be maculopapular, petechial, or hemorrhagic. Anaphylaxis has been reported in sensitized persons. |
Black fly (Simulium) | Itchy or painful; may vesiculate. |
Chigger (Trombicula irritans, others) | Itchy maculopapular lesion. |
Deer fly (Chrysops) | Painful papule with central punctum. |
Flea | Early urticaria and erythema; itchy papules, often clustered. |
Mosquito | Itchy papule, wheal. |
Myiasis | Infestation of human tissue by fly larvae. Manifestations vary with fly species. |
Pediculosis due to | |
Pediculus humanus (body lice) | Itchy wheals; maculopapular rash, may be hemorrhagic. |
Pediculus humanus (head lice) | Itching; red papules, white nits. |
Phthiriasis due to Pthirus pubis (pubic lice) | Itching; lice attach to pubic hair, eyelids. |
Midge (Culicoides) | Itchy wheal and papule. |
Sand fly (Phlebotomus) | Itchy or painful wheal, papule. |
Scabies (Scarcoptes scabiei) | Itchy papules, vesicles; linear burrows; occasional urticaria, nodules. |
Tick | |
Hard ticks | Regional edema; chronic nodule (tick granuloma). |
Soft ticks | Macules, papules, central necrosis. |
Triatomine bugs (Reduviidae) | Transient urticaria; vesicles or pruritic papules. |
Tsetse fly (Glossina) | Painful, red indurated lesion. |
Tungiasis (Chigoe fleas, Tunga penetrans) | Burrow into host tissue, often feet; itchy white papules or vesicles with central black depression; may ulcerate. |
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