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