Common outpatient dermatologic presentations and when to refer to specialty care, as tested on USMLE Step 2 CK.
29 cards · basic cards · AI-written, checked twice. Edit anything.
- What test confirms a diagnosis of tinea corporis?
Show answer
KOH preparation showing branching hyphae- First-line treatment for localized tinea corporis
Show answer
Topical antifungal (e.g., terbinafine or clotrimazole)- What organism causes tinea versicolor?
Show answer
Malassezia furfur (a yeast)- Classic KOH microscopy finding in tinea versicolor
Show answer
Spaghetti and meatballs pattern (hyphae and spores)- Classic lesion appearance of impetigo
Show answer
Honey-colored crusted lesions- Most common causative organisms of impetigo
Show answer
Staphylococcus aureus and group A Streptococcus- Classic body distribution of plaque psoriasis
Show answer
Extensor surfaces (elbows and knees)- What is the Auspitz sign?
Show answer
Pinpoint bleeding when a psoriatic scale is removed- Typical distribution of atopic dermatitis in adults
Show answer
Flexural surfaces (antecubital and popliteal fossae)- What is the atopic triad?
Show answer
Atopic dermatitis, asthma, and allergic rhinitis- What type of hypersensitivity reaction is allergic contact dermatitis (e.g., poison ivy)?
Show answer
Type IV (delayed, cell-mediated) hypersensitivity- Classic locations and appearance of seborrheic dermatitis
Show answer
Scalp and nasolabial folds with greasy, yellow scale- Clinical significance of an actinic keratosis
Show answer
It is a precursor lesion to squamous cell carcinoma- Classic appearance of basal cell carcinoma
Show answer
Pearly papule with rolled borders and telangiectasias- Metastatic behavior of basal cell carcinoma
Show answer
Rarely metastasizes; grows by local invasion
FlashKeepers