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Derm Exam 1 > Infestations and Bites > Flashcards

Infestations and Bites Flashcards

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Dermatology Board Prep flashcards
1
Q

what is pediculus humanus var. capitis

A
  • head lice
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2
Q

pedulosis capitis is found where

A
  • proximal hair shaft of occipital scalp
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3
Q

are pediculosis capitis moveable

A
  • not movable along hair shafts
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4
Q

pediculosis capitis most common in what age group

A
  • children
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5
Q

pediculosis capitis transmitted by

A
  • direct contact - combs - pillows
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6
Q

pediculus humanus var. capitis is what kind of louse

A
  • head louse
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7
Q

pediculus humanus var. corporis is what kind of louse

A
  • body louse
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8
Q

phthrius pubis is what kind of louse

A
  • pubic or crab louse
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9
Q

what indicates live infection in pediculosis

A
  • live adult lice - immature nymphs (nits) - viable eggs
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10
Q

treatment of pediculosis

A
  • physical removal - OTC/prescription topical therapy - 1% permethrin lotion
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11
Q

treatment of pediculosis for resistant cases

A
  • topical ivermectin - malathion
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12
Q

what condition is indicative of burrows in the web spaces of the hand

A
  • scabies (Sarcoptes scabiei)
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13
Q

diagnostic procedure for scabies

A
  • skin scraping (mineral oil prep)
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14
Q

what is the name for scabies feces

A
  • scybala
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15
Q

scabies is more common in what gender and age

A
  • women and children
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16
Q

scabies is more common in what setting

A
  • group settings
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17
Q

scabies is spread by

A
  • direct contact
18
Q

most common sites for scabies

A
  • finger webs - waistline - umbilicus - breast - axilla - scrotum and penis
19
Q

what of scabies are linear markings in the skin due to movement of the mite where are they found most readily

A
  • burrows - interdigital spaces - wrists - elbows
20
Q

what is a severe highly contagious variant of scabies found in disabled and immunocompromised patients

A
  • crusted scabies
21
Q

treatment of crusted scabies

A
  • oral ivermectin
22
Q

treatment of scabies

A
  • 5% permethrin cream - oral ivermectin
23
Q

overal ivermectin not recommended for

A
  • pregnant or lactating women
24
Q

what is cimix lectularius

A
  • bed bug
25
Q

bed bugs live where

A
  • furniture - mattress seams
26
Q

characteristic of cimix lectularius

A
  • distinct odor
27
Q

cimix lectularius during the day

A
  • hidden
28
Q

cimix lectularius at night

A
  • feed at night
29
Q

cimix lectularius bites

A
  • multiple in a linear array - breakfast, lunch, dinner patterns
30
Q

cimix lectularius can live ___ without feeding

A
  • 1 year
31
Q

cimix lectularius saliva contains

A
  • vasodilators - anti-platelet agents
32
Q

cimix lectularius treatment for bites

A
  • topical corticosteroids
33
Q

what starts out as a painful bump, moves to a zone of erythema with central ischemia surrounding a hemorrhagic bulla also known as

A
  • brown recluse spider bite - red, white and blue sign
34
Q

brown recluse spider has what characteristic marking on the cephalothorax

A
  • violin-shaped
35
Q

brown recluse spider found where in the US live where

A
  • midwest - southeast - dark areas, attics, boxes, clothing
36
Q

brown recluse spider initial wound may progress to

A
  • necrosis - deep ulcer formation
37
Q

important to rule out _____ with brown recluse spider bite

A
  • MRSA infection
38
Q

tissue necrosis with brown recluse spider bites may occur due to

A
  • sphingomyelinase
39
Q

treamtment of brown recluse spider bite

A
  • supportive care - pain control
40
Q

with pruritic papules, what do you think?

A
  • scabies
41
Q

with edematous papules, what do you think?

A
  • bedbug bites

Derm Exam 1 (23 decks)

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