19.5 Infectious Disorders

Question 1

Impetigo

Answer 1

Superficial bacterial skin infection - often S. aureus or S. pyogenes

Question 2

What is the clinical presentation of impetigo?

Answer 2

Erythematous macule that progresses to pustules and is usually found on the face - “crusted and honey colored”

Question 3

Cellulitis

Answer 3

Dermal infection due to S. aureus or S. pyogenes

Question 4

How does cellulitis present?

Answer 4

Red, tender swollen rash with a fever

Question 5

Necrotizing Fasciitis

Answer 5

Necrosis of subcutaneous tissue due to infection with anaerobic “flesh-eating” bacteria

Question 6

What is a common finding with necrotizing fasciitis?

Answer 6

Crepitus due to production of CO2

Question 7

Staphylococcus Scalded Skin Syndrome

Answer 7

Exfoliative A and B toxins of S. aureus lead to epidermolysis of stratum granulosum - superficial

Question 8

Verruca (warts)

Answer 8

Flesh colored papillose with a rough surface and is due to an HPV infection of keratinocytes - hands and feet are common locations

Question 9

Molluscum Contagiosum

Answer 9

Firm pink umbilicate papules due to poxvirus

Question 10

Who is molluscum contagiosum most commonly found in?

Answer 10

Children - but is also sexually transmitted