Dermatology Bacterial Infections And Infestations

Front 1

Most common bacteria to infect the skin

Back 1

Staphylococci or Streptococci

Front 2

Impetigo definition and types

Back 2

Most superficial bacterial infection - epidermis
Bullous and Non-bullous

Front 3

Impetigo usually caused by?

Back 3

Staphylococcus aureus

Front 4

Impetigo characteristics

Back 4

Most common bacterial skin infection in children
Highly contagious
More common in hot, humid environments
Incubation period of 10-20 days

Front 5

Impetigo predisposing factors

Back 5

poor health/hygiene
malnutrition
pre-existent skin disease

Front 6

Most common site of S. aureus colonization

Back 6

Anterior nares
20% of population asymptomatic nasal carriers

Front 7

Non-Bullous Impetigo, most common bacteria, and where does it occur?

Back 7

S. aureus > S. pyogenes
occurs at sites of minor trauma

Front 8

Classic feature of non-bullous impetigo?

Most frequently involved area on body?

Back 8

Honey colored crusts


face and exremities

Front 9

Which impetigo is more common?

Back 9

70% of all cases are non-bullous

Front 10

Non-bullous impetigo clinical features

Back 10

Benign, self-limited. Untreated lesions usually resolve w/in 2 wks

Front 11

Bullous Impetigo is most common in? and first presents as what type of lesion

Back 11

Most commonly in neonate
Starts as small vesicles, progressing to flacid, transparent bullae

Front 12

Treatment of Impetigo

Back 12

Superficial lesions - topical ointment
Systemic or widespread case - antibiotics

Front 13

Staphylococcal Scalded Skin Syndrome

Back 13

Toxin causes split at the granular cell layer of the epidermis - flaccid bullae

Front 14

Staphylococcal Scalded Skin Syndrome clinical features and progression

Back 14

fever, irritability, severe skin tenderness
erythema (hrs)->flacid bullae (1-2 dys) ->moist skin, varnish-like crust
skin re-epithelializes in 10-14 days, no scarring

Front 15

Staphylococcal Scalded Skin Syndrome Treatment

Back 15

Anitbiotics

Front 16

Cellulitis - what is it?

Back 16

Infectious process of the deep dermis and subcutaneous tissue

Front 17

Cellulitis - caused by?

Back 17

S. pyogenes and S. aureus

Front 18

Cellulitis - symptoms, lesions, treatment, & what to avoid

Back 18

Systemic symptoms - fever, chills, malaise
Ill-defined, non-palpable borders
Antibiotics
NSAIDs may mask symptoms

Front 19

Folliculitis - what is it?

Back 19

infection of the hair follicle, may be superficial or deep

Front 20

Folliculitis - most common infectious cause?

Back 20

S. aureus

Front 21

Folliculitis - frequently involves

Back 21

benign condition frequently involving the face, chest, back, axillae, or buttocks

Front 22

Folliculitis - lesions
Deep follculitis - lesions

Back 22

small, 1-4mm pustules or crusted papules on an erythematous base

large, tender erythematous papules, often with a center pustule

Front 23

Hot Tub Folliculitis - caused by?

Back 23

Pseudomonas aeruginosa

Front 24

Hot Tub Folliculitis - clinical presentation

Back 24

asymptomatic perifollicular papules/pustules seen 1-3 days after exposure to contaminated H2O. Only seen in areas submerged in H2O

Front 25

Hot Tub Folliculitis - Treatment

Back 25

self-limited, 7-10 days. Systemic antibiotics not indicated

Front 26

Pseudofolliculitis Barbae - what is it?

Back 26

Ingrown hairs. Foreign body rxn rather than infection.

Front 27

Pseudofolliculitis Barbae - who's prone to it and what are the lesions like?

Back 27

Black males
papular, pustular, follicular-based disorder, inflammatory response

Front 28

Hidradenitis Suppurativa - what is it?

Back 28

affects apocrine gland-bearing skin sites. Inflammatory nodules and sterile abscesses.
Chronic and painful
Recurrent boils and draining sinus tracts
Not an infectious process

Front 29

Hidradenitis Suppurativa - who's prone to it and where does it occur

Back 29

Occurs in obese patients, affects the axillae and anogenital regions

Front 30

Hidradenitis Suppurativa - lesions

Back 30

Hypertrophic scars, sinus tracts, chronic drainage

Front 31

Hidradenitis Suppurativa - treatment

Back 31

weight reduction, intralesional corticosteroids

Front 32

Abscesses, Furuncles

Back 32

Walled off collections of pus
Abscess can occur anywhere on the body
Furuncles involve a hair follicle

Front 33

Carbuncle

Back 33

A collection of inflamed and infected follicles

Front 34

Furuncle - what is it? who gets it? what's the lesion?

Back 34

Acute inflammatory abscesses of haif follicle and surrounding tissue.
Common in adolescents and young adults.
Hard, tender, red nodule, enlarges, painful and fluctuant

Front 35

Furuncle - most common causative organism?

Back 35

S. aureus

Front 36

Carbuncle - what is it? where does it occur? symptoms and resolution?

Back 36

Collections of furuncles, which extend deep into the subcutaneous tissue. Surface has draining sinus tracts.
Occurs in areas of thick skin
Systemic symptoms usually present.
Slow healing, always leaves a scar.

Front 37

Abscesses, Furuncles, Carbuncle treatment

Back 37

If simple, treatment may not be needed.
If fluctuant (or an infecious process) - incision and drainage
Give systemic antibiotics if furuncles around nose, or external auditory meatus; if lesions are large and recurrent, or not responding to local care

Front 38

MRSA

Back 38

endemic in most US hospitals

Front 39

MRSA common presentation

Back 39

abscess, abscess + cellulitis, cellulitis

Front 40

MRSA - most important risk factor

Back 40

None, it's everyone and not choosy.

Front 41

MRSA - two strains

Back 41

Community acquired and hospital acquired. Becoming blured

Front 42

MRSA diagnosis

Back 42

CULTURE!! you have to know what you are treating

Front 43

MRSA treatment

Back 43

Incision and drainage!!