ABD Pediatric Dermatology 3

Question 1

A 5-year-old presents with honey-colored crusted erosions around the nose and mouth. What is the most common causative organism?

Accepted Answer

Staphylococcus aureus

Answer

Non-bullous impetigo is most commonly caused by Staphylococcus aureus.

Question 2

An infant develops widespread flaccid bullae and superficial desquamation with a positive Nikolsky sign but spares mucous membranes. What is the diagnosis?

Accepted Answer

Staphylococcal scalded skin syndrome

Answer

SSSS is caused by staphylococcal exfoliative toxins, cleaves the granular layer, and characteristically spares mucosa.

Question 3

A child has multiple dome-shaped umbilicated papules on the trunk. What is the causative agent?

Accepted Answer

Poxvirus

Answer

Molluscum contagiosum is caused by a poxvirus and produces umbilicated papules.

Question 4

A 4-year-old presents with fever, a 'slapped cheek' facial erythema, followed by a lacy reticular rash on the extremities. What is the etiology?

Accepted Answer

Parvovirus B19

Answer

Erythema infectiosum (fifth disease) is caused by parvovirus B19 with the classic slapped-cheek appearance.

Question 5

A child with tuberous sclerosis is examined for cutaneous findings. Which lesion is a well-recognized diagnostic criterion?

Accepted Answer

Ash-leaf macules

Answer

Hypopigmented ash-leaf macules are an early cutaneous marker of tuberous sclerosis.

American Board of Dermatology (ABD) Practice Test

American Board of Dermatology (ABD) Practice Test

ABD Pediatric Dermatology 3