Dermatologic System Disorders Flashcards
7 cards from real Physician Assistant practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Dermatologic System Disorders flashcards as text
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?
Answer: Pityriasis rosea
A herald patch followed by a Christmas-tree distribution eruption is classic for pityriasis rosea.
A 6-year-old has a few honey-crusted lesions around the nose with no systemic symptoms. What is the preferred initial treatment?
Answer: Topical mupirocin
Limited nonbullous impetigo is treated with topical mupirocin or retapamulin.
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?
Answer: Desmoglein 3
Pemphigus vulgaris is caused by IgG against desmoglein 3 (and 1), producing intraepidermal acantholysis.
A pearly, translucent papule with rolled borders and overlying telangiectasias on the nose of a 65-year-old most likely represents which lesion?
Answer: Basal cell carcinoma
Basal cell carcinoma classically appears as a pearly papule with rolled borders and telangiectasias.
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?
Answer: Oral griseofulvin
Tinea capitis requires systemic therapy such as griseofulvin or terbinafine because topicals cannot penetrate the hair shaft.
Sudden eruption of numerous seborrheic keratoses in an adult (sign of Leser-Trélat) should prompt evaluation for which malignancy?
Answer: Gastric adenocarcinoma
Leser-Trélat sign is a paraneoplastic marker most often associated with GI adenocarcinoma, especially gastric.
Toxic epidermal necrolysis is distinguished from Stevens-Johnson syndrome by epidermal detachment involving what body surface area?
Answer: Greater than 30%
SJS involves 30% BSA.
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