Bacterial Infections of the Skin

Question 1

Impetigo

Answer 1

Skin infection due to S pyogenes and S aureus alone or together.

Cause small thin walled vesicles or pustules that rupture into honey colored crusts.

Tx: Clindamycin or Dicloxicillin

Question 2

Ecthyma

Answer 2

Superficial infection by Grpup A strep (pyogenes) or S aureus

Bulla/vesicals that errup revealing a healing ulcer with scarring.

Most commonly effect the extremities, no honey crusting!

Treat with Dicloxacillin.

Question 3

Erysipelas and Cellulitis

Answer 3

When strep gets into lymphatics erysipelas occurs when it involves the deeper dermis and fat.

Cellulitis then occurs.

ERISYPELAS unlike cellulitis has sharply marcated borders that are elevated.

Question 4

Difference between erysipelas and cellulitis?

Answer 4

erysipelas has well demarcated elevated borders.

Cellulitis is redenning without well marcated borders.

Both caused by strep infections in the deeper dermal lymphatics.

Question 5

What type of infections are most commonly caused by S. Aureus in the skin?

Answer 5

Abscesses or open wounds

Question 6

What type of wounds are H. influenza most commonly associated with?

Answer 6

Facial cellulitis in young children.

Question 7

What type of wounds are P multocida commnly found in?

Answer 7

Cat and dog bites.

Question 8

What type of wounds are P aeruginosa found in?

Answer 8

Immunocompromised hosts.

Question 9

Farunce

Answer 9

Infection of the hair follicle.

Question 10

Erythrasma

Answer 10

Superficial infection usually asymptomatic involving intertriginous areas.

Causitive is Corynebacterium mnutissimum causes Coral Red under the woods lamp!!

Treat with Whitefields ointment or topical miconazole.

Question 11

Petechiae, splinter hemorrhages, oslers nodes (red painful nodes on pads of fingers and toes) and Janeway lesions (nontender erythematous macules on palms and soles)

Answer 11

Highly suspicious of Bacterial Endocarditis!

Question 12

Veruca Vulgaris

Answer 12

Most common form of wart on the fingers and hands.

Question 13

Veruca plantaris

Answer 13

Trauma at pressure sites on the plantar surface of teh foot.

Tender on lateral compression.

Question 14

Mosaic warts

Answer 14

Very large, diffuse group of warts with ill-defined boundaries.

Question 15

Best conservative approach to wards?

Answer 15

Acid therapy
60% Salicylic acid
or
80% monochloracetic acid (best for mosaic)