2/14 Bacterial Skin Infections Extra Pics

Question 1

What condition?

Answer 1

Staph Scalded Skin Syndrome (SSSS)

Question 1

Answer 1

Cellulitis

Question 2

What condition?

Answer 2

Bullous impetigo. May only see this (remnants of former blisters)

Question 3

Answer 3

Impetigo

Question 3

Answer 3

SSSS

Note pustules in the neck. Could be yeast, bacteria, viral

But here it is staph

Question 3

Answer 3

Impetigo

Question 5

Answer 5

Hot tub folliculitis

Pseudomonas aeruginosa

Question 7

what is this? how different from SSSS?

Answer 7

Toxic epidermal necrolysis

Skin sloughs off full-thickness (epidermal-dermal junction is destroyed).

SSSS is more superficial (doesn’t even scar). stratum granulosum only.

Question 8

Cellulitis: clinical signs?

Blood cultures?

Answer 8

Signs of infection: rubor, calor, dolor, tumor

Blood cultures often neg

Question 9

Appearance of erysipelas v cellulitis?

Answer 9

Erysipelas: well-demarcated edge. Peau d’orange texture.

Cellulitis: more spread out, less well demarcated.

Question 10

Answer 10

SSSS

Toxic erythema (redness due to throughout the body)

Question 10

Answer 10

Folliculitis

infected hair follicles

Question 11

Answer 11

Carbuncle

Question 12

Answer 12

Furuncle

Question 14

Answer 14

Furuncles

Question 15

Answer 15

Cellulitis

Streptococcal perianal disease: recurrent bright perianal erythema in children. likely due to strep.

Question 15

Answer 15

Erysipelas

The swelling and sharp demarcation are characteristic of erysipelas. The area involved is usually very tender. The patient usually feels quite ill. Allergic contact dermatitis and rosacea are in the differential diagnosis.

Question 16

Answer 16

necrotizing fasciitis.

Involvement of perineum and genitalia –> Fournier’s gangrene

(this pic due to circumcision)

Question 18

What is this? What should I be looking for?

How is it different from HSV?

Answer 18

Impetigo

Look carefully here for vesicles. Lesions start out as vesicles, then become pustules.

HSV: grouped lesions, history of getting this every 6 months at same location.

HSV lesions are more sharply-defined, “punched out”, rounded.

(HSV pic from internet, hopefully it’s what it said it is!)

Question 19

Answer 19

SSSS

Question 20

What condition? what are these called?

Answer 20

Impetigo

Hemorrhagic bulla

Question 21

SSSS: what is the cause?

Answer 21

Staph aureus produces an endotoxin (exfolatin A, exfolatin B) that circulates, splits the skin at the superficial granular layer

Question 23

Answer 23

Carbuncle

Question 24

Answer 24

Carbuncle (ruptured)

Question 25

Answer 25

Hot tub folliculitis.

Acne is NOT usually this uniform looking. Hot tub folliculitis often has pustules that look very monomorphic (the same) and uniform, with a spread of erythema away from the pustule of a few mm. This is also what staphylococcal folliculitis looks like.