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ADS 12Ed > Scabies > Flashcards

Scabies Flashcards

1
Q

Cause of Scabies

A

Sarcoptes scabiei (Itch mite)

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2
Q

Physical features of Sarcoptes scabiei

A

Oval, ventrally flattened mite with dorsal spines

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3
Q

Innoculation of scabies mite

A

Fertilized female burrows into Stratum Corneum and deposits eggs

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4
Q

Classic lesions of Scabies

A

Pruritic Papular lesions, Escoriations and Burrows

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5
Q

Site predilection of Scabies

A
  • Finger webs
  • Wrists
  • Axillae
  • Areolae
  • Umbilicus
  • Lower Abdomen
  • Genitals
  • Buttocks
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6
Q

Imaginary circle intersecting main sites of Scabies Involvement

A

Circle of Hebra

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7
Q

Sites along Circle of Hebra

A
  1. Axillae
  2. Elbow flexures
  3. Wrists and Hands
  4. Crotch
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8
Q

Distribution of scabies in adults vs infants

A

Adults: Scalp and Face

Infants: Entire cutaneous surface

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9
Q

Characteristics of scabies burrows

A

Slightly elevated, grayish, tortous lines on the skin

Vesicle/Pustule containing the mite at end of the burrow

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10
Q

How to identify scabies burrows?

A
  1. Drop of India ink or Gentian violet on the area

then removed with alcohol.

= Thin, threadlike burrows retain the ink

  1. Drop Mineral oil on lesion then scrape using blade or needle. Check under microscope
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11
Q

Differential diagnosis of Scabies

A
  • Bullous pemphigoid
  • Langerhans cell histiocytosis
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12
Q

Variant of scabies with:

  • Dull red nodules 3-5mm
  • Active scabies
  • May or may not itch
  • Scrotum, Penis or Vulvar areas
A

Nodular scabies

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13
Q

A variant of scabies in

Immunocompromised and Debilitated individuals

A

Crusted Scabies

or

Norwegian Scabies

or

Hyperkeratotic Scabies

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14
Q

Characteristics of Crusted Scabies

A
  • Crusts teem with mites
  • Facial involvement
  • Slight pruritus
  • Swollen and crusted fingertips
  • Distorted nails
  • Severe fissuring on genitalia and buttocks
  • Heavy keratosis on pressure-bearing areas
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15
Q

Transmission of Scabies

A
  1. Close personal contact
  2. Contaminated linens and clothing
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16
Q

When does sensitization begin in Scabies?

A

2-4 weeks after the onset of infection

17
Q

Hallmark symptom of scabies

A

Nocturnal pruritus

18
Q

Most effective medication for Scabies

A

Permethrin 5% cream

sig. Thoroughly rub into skin from NECK to FEET

with particulat attention to creases, perianal areas, umbilicus and free nail edge and folds.

Wash off 8-10 hours later. Change linens and clothing.

19
Q
A

ADS 12Ed (7 decks)

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