Pustules, Vesicles, Bullae

Question 1

Acne cause and sx

Answer 1

Propionebacterium acnes
Staph epidermidis
Inflammatory papules, pustules, and cysts

Question 2

Cutaneous candidiasis

Answer 2

Candida albicans
No fever
Erythematous exudative lesions of mucosa and skin
Satellite pustules

Question 3

Impetigo cause and sx

Answer 3

S. aureus or S. pyogenes
Vesicles that become pustular and crust with honey color
On extremities and face

Question 4

Folliculitis cause and sx

Answer 4

S. aureus and P. aeruginosa
Fever with pseudomonas (hot tub folliculitis)
Erythematous papules involving hair follicles. Often become pustules

Question 5

Hidradenitis suppurative cause and sx

Answer 5

S. aureus
Multiple inflamed tender cysts becoming abscesses in axillary and perianal skin
Sweat gland cysts

Question 6

Gonococcemia cause and sx

Answer 6

N. gonorrhoeae 
Few hemorrhagic pustules on extremities 
Tiny red petechiae
Fever, arthralgia, abnormal liver tests 
Joints, fingers

Question 7

Furunculosis/Carbunculosis cause and sx

Answer 7

S. aureus
Tender, indurated, yellow head
inflammatory nodule, becomes pustular and then necrotic
From blocked or damaged follicles

Question 8

Cutaneous myiasis cause and sx

Answer 8

Dermatobia hominus
Maggots
Tropics and subtropics

Question 9

Kerion cause and sx

Answer 9

Trichophyton verrucosum
Painful, rounded, boggy, erythematous, carbuncle-like tumor
Often suppurating 
Usually on scalp or beard 
No fluorescence with woods lamp

Question 10

Varicella cause and sx

Answer 10

HHV3/VZV
Dewdrops on rose petal
Lesions in all diff stages (macules, vesicles, crusts)
Fever

Question 11

Hand foot and mouth disease cause and sx

Answer 11

Coxsackievirus A16 and Enterovirus 71

Vesicles surrounded by red areola

Question 12

Herpangina cause and sx

Answer 12

Coxsackievirus A or other enterovirus
Small gray papulovesicles with erythema surrounding and changes to shallow ulcer
Usually on tonsillar pillars but also soft palate, uvula, or tongue

Question 13

Herpes cause and sx

Answer 13

HSV
Severe pain
Vesicles to pustules to crusty yellow ulcers

Question 14

Herpes zoster cause and sx

Answer 14

Shingles - VZV/HHV3
Vesicles on red base, plaques
Painful
Follow dermatomes

Question 15

Variola cause and sx

Answer 15

Smallpox virus
Widespread vesicles ALL THE SAME STAGE
Starts in the head and distal extremities and spreads inward to trunk
Guarnien bodies (cytoplasmic inclusions)
Not confined to a dermatome
Fever

Question 16

Rickettsialpox cause and sx

Answer 16

Rickettsia akari from mites on rodents 
Fever first then rash
Not on palms/soles
Herald lesion at bite site 
Black Eschar

Question 17

Vibrio vulnificus sx

Answer 17

Typical pt: men over 40 with liver probs who ingest seafood. Or assoc with seafood

Leukopenia, increases fibrin degradation products
GI sx first then diff lesions: hemorrhagic bullae then necrotic ulcers

Question 18

Orf aka ecthyma infectiosum cause and sx

Answer 18

Orf virus from sheep
Reddish purple tender papule or pustule
Red in the center, then white around that, then an outer red halo

Question 19

Molluscum contagiousum sx

Answer 19

Flesh colored to pink UMBILICATED papules