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Pediculus humanis capitis
- - head louse
- - causes puritis and skin irritation
- - tx- lindane
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Pediculus humanus humanus
- - body louse
- - causes puritis
- - vector for typhus, trench fever and relapsing fever
- - tx- lindane
- - often found on homeless and can cause the leathery skin (homeless fever)
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Pthirus pubis
- - crab louse (pediculosis inguinalis or pthiriasis)
- - intense itching
- - sexually transmitted
- - tx- lindane
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pulex irritans
- - human flea
- - causes pruritis and erythema
- - vector of plague and murine typhus
- - tx- antipruritics and antihistamines
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sarcoptes scabei
- - causes scabies, loves skin creases
- - intense itching
- - transmission by direct contact
- - mite in skin scrapings dissolved in KOH
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demodex spp
- - human follicle mite
- - associated with acne, blackheads, blepharitis and truncal rashes
- - papular folliculitis in immunocompromised
- -
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Eutombicula spp/ Trombicula automnalis
US Europe
- - chiggers
- - larvae cause intense pruritis and dermatitis with erythmatous marks progressing to papules and nodules
- - vector for scrub typhus
- - tx- antipruritics and antihistamines
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Dermacentor andersoni/ variabilis
- - tick
- - usually cause erythmatous papules, but can occasionally cause paralysis (rocky mountain spotted fever)
- - vector for Lyme disease (erythma migrans)
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Cimex lectularius
- - bed bug
- - small red lesions to hemorrhagic bullae, pruritis, sleeplessness, anemia
- - linear lesions
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kissing bugs
- - triatomes
- - small red nodules, Romanas sign
- - vector of T. cruzi (Chagas disease)
- - nocturnal feeding
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Loxosceles reclusa
- - brown recluse, violin spider
- - intense local pain
- - venom: phospholipase & sphingomyelinase D => necrosis
- - eschar formation
- - tx is palliative
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Lactrodectus spp
- - black widow, hour glass
- - causes lactrodectism (neuromyopathic araneism)
- - generalized pain, N/V, faintness, vertigo, perspiration
- - venom= a-latrotoxin
- - tx- antivenom
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Centruroides spp and Tityus spp.
- - scorpions
- - venom- neurotoxin and hemolytic toxin
- - radiating, burning pain, swelling, discoloration and necrosis
- - tx- antivenom w/in 1 hour
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