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Derm > Bacterial Skin Infections > Flashcards

Bacterial Skin Infections Flashcards

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Dermatology Board Prep flashcards
1
Q

What is lymphangitis?

A

Red streaks extending proximally from areas of cellulitis

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2
Q

Which organism is the most common cause of folliculitis

A

Staph aureus

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3
Q

Which organism causes “hot tub folliculitis”

A

Psuedomonas

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4
Q

Does folliculitis itch?

A

Yes

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5
Q

Which is worse: a furuncle or a carbuncle

A

Carbuncle

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6
Q

True or false:

Most cases of folliculitis are self limiting and do not require antibiotics

A

True

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7
Q

What are the 3 variants of impetigo?

A
  1. Nonbullous
  2. Bullous
  3. Ecthyma
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8
Q

“Honey colored crusting”

A

Non bullous impetigo

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9
Q

“Punched out” ulcers with overlying crust (look like cigarette burns)

A

Ecthyma

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10
Q

Which organism usually causes Nonbullous and Bullous impetigo

A

staph aureus

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11
Q

Which organism usually causes ecthyma

A

Strep

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12
Q

What is the most common organism that causes cellulitis

A

B-hemolytic strep

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13
Q

If cellulitis has purulent drainage, it is more likely to be caused by (strep/staph)

A

Staph

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14
Q

What is this:

A superficial raised cellulitis with a sharply demarcated border. Tender, warm, and intensely erythematous

A

Erysipelas

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15
Q

Which parts of the body are usually affected by erysipelas?

A

Cheeks

Legs

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16
Q

Which bacteria is the main pathogen that causes erysipelas?

A

B-hemolytic strep (GAS)

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17
Q

True or false:

Erysipelas is a form of cellulitis

A

True

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18
Q

Best treatment for abscess

A

Incision and drainage

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19
Q

Patients with erysipelas are (very sick/not sick)

A

Very sick

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20
Q

Which bacteria most commonly causes abscesses?

A

Staph aureus

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21
Q

Abscesses do not always require antibiotics after you drain them.

When DO they need antibiotics?

A

> 2cm or multiple abscesses

Toxic

Extensive cellulitis

Immunosuppression

Indwelling medical device

High risk for transmission (athlete, military)

22
Q

Risk factors for MRSA

A

Antibiotic use

Invasive device

Hospitalization

Group settings (miliatary, nursing home, etc)

Chronic wound

MRSA colonization in nose

Skin trauma (tattoo, IVDU)

23
Q

“I have a spider bite”

A

MRSA

24
Q

Oral antibiotics for MRSA

A

Bactrim

Doxycycline

Clindamycin

25
Q

risk factors for cellulitis

A

local trauma (bug bites, lacs, punctures)

spread of preceding or concurrent skin lesion (furuncle, ulcer)

preexisting skin infection (tinea pedis)

inflammation (local dermatitis, radiation)

edema and impaired lymphatics

26
Q

non-purulent cellulitis abx tx

A

tx for b-hemolytic strep (GAS) with:

cephalexin

amoxicillin

augmentan

clindamycin

27
Q

purulent cellulitis abx tx

A

call ID and tx for MRSA and strep with:

clindamycin

bactrim

doxycycline + amoxicillin

28
Q

how many days do you need to give abx in cellulitis

A

5

29
Q

what could you use to decrease post inflammatory lymphatic damage by cellulitis

A

oral steroids

30
Q

for hospitalized pts w/ cellulitis, what tx should you consider

A

empiric tx for MRSA

31
Q

abx used to tx MRSA

A

IV vancomycin- DOC

the rest have adverse effects/ are unreliable:

linezolid

doxycycline/ minocycline

bactrim

clindamycin

32
Q

pain, bright erythema, shiny, plaque like edema w/ sharply defined margins

A

erysipelas

33
Q

erysipelas has what associated sxs

A

chills, fever, HA, vomiting, joint pain, high white count

34
Q

erysipelas tx

A

empiric oral abx:

Pen V

amoxicillin

clindamycin

macrolide

35
Q

erythematous, warm, fluctuant nodule w/ several small pustules throughout surface, TTP

A

abscess

36
Q

what abx are recommended with abscess tx

A

clindamycin

bactrim

tetracycline

hospitalized- vanco/ linezolid/ daptomycin

37
Q

acute, round, tender, circumscribed perifollicular abscess that ends in central pus

A

furuncle aka boil

38
Q

coalescence of several inflamed follicles into a single inflammatory mass w/ purulent drainage from multiple follicles

A

carbuncle

39
Q

furuncle/carbuncle tx

A

oral abx, warm compress, +/- I and D

40
Q

small, raised, erythematous, occasionally itchy pustules less than 5 mm

A

folliculitis

41
Q

can folliculitis be transmitted

A

genital folliculitis can

42
Q

folliculitis tx

A

clean w/ abx soap

oral/ topical anti-staph (mupirocin)

topical clindamycin

+/- drainage

43
Q

is impetigo infectious

A

yes- easily

44
Q

common locations of bullous impetigo

A

face, extremities, diaper area

45
Q

in bullous impetigo, the bullae are ____ and when they rupture they leave a ___

A

in bullous impetigo, the bullae are FLACCID and when they rupture they leave a THICK BROWN CRUST

46
Q

tx of impetigo

A

oral abx

47
Q

rapidly progressing erythema, edema, fever, systemic sxs, crepitus, ecchymosis

A

necrotizing fasciitis

48
Q

what are poor prognostic factors associated w/ necrotizing fasciitis

A

delayed dx

over 50 yo

diabetes

atherosclerosis

infection involving trunk

49
Q

who do you immediately consult if you suspect necrotizing fasciitis

A

surgery- immediately

50
Q

is cellulitis dangerous

A

yes- untreated cellulitis can lead to sepsis and death

51
Q

abscess subtypes

A

furuncles and carbuncles

Derm (8 decks)

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