Physician Assistant Dermatologic System Disorders 2

Question 1

A 19-year-old has a single 3-cm oval salmon-colored scaly patch on the trunk, followed 10 days later by smaller oval lesions aligned along skin cleavage lines. What is the most likely diagnosis?

Accepted Answer

Pityriasis rosea

Answer

A herald patch followed by a Christmas-tree distribution eruption is classic for pityriasis rosea.

Question 2

A 6-year-old has a few honey-crusted lesions around the nose with no systemic symptoms. What is the preferred initial treatment?

Accepted Answer

Topical mupirocin

Answer

Limited nonbullous impetigo is treated with topical mupirocin or retapamulin.

Question 3

A 50-year-old has painful oral erosions and flaccid skin bullae that extend with lateral pressure. Autoantibodies are most likely directed against which antigen?

Accepted Answer

Desmoglein 3

Answer

Pemphigus vulgaris is caused by IgG against desmoglein 3 (and 1), producing intraepidermal acantholysis.

Question 4

A pearly, translucent papule with rolled borders and overlying telangiectasias on the nose of a 65-year-old most likely represents which lesion?

Accepted Answer

Basal cell carcinoma

Answer

Basal cell carcinoma classically appears as a pearly papule with rolled borders and telangiectasias.

Question 5

A 7-year-old has a scaly patch of alopecia with broken hairs and posterior cervical lymphadenopathy; KOH shows hyphae. What is the appropriate treatment?

Accepted Answer

Oral griseofulvin

Answer

Tinea capitis requires systemic therapy such as griseofulvin or terbinafine because topicals cannot penetrate the hair shaft.

Physician Assistant Practice Test

Physician Assistant Practice Test

Physician Assistant Dermatologic System Disorders 2