Browse the corpus
Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.
1 passage
©2013 UpToDate ® Print Email Arthropod bites and infestations 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 Phirus 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