Source / episode info
- **Episode:**242
- **Title:**Divine Intervention Episode 242 – USMLE Dermatology (Part 1 of 3) + 2CK, 10 hr Course (6/27/20).
- **Published:**2020-06-14
- Source:Episode page
One-liner
This episode provides a comprehensive review of high-yield dermatological conditions, emphasizing classic physical exam findings (e.g., flexural vs. extensor distribution), specific diagnostic criteria for inflammatory rashes like psoriasis and atopic dermatitis, and appropriate management protocols for acne, fungal infections, and rosacea.
High-yield summary
- Atopic Dermatitis: Characterized by intense pruritus; in adults, lesions favor flexural surfaces (antecubital/popliteal fossae); chronic scratching leads to lichenification.
- Psoriasis: Typically presents on extensor surfaces (elbows, knees, scalp) with thick, erythematous plaques; systemic steroids are absolutely contraindicated due to risk of erythroderma and severe complications.
- Fungal Infections (Tinea): Diagnosis relies on KOH prep findings: Candida shows pseudohyphae/spores; Tinea species show branching hyphae. Treatment depends on location (topical for skin, oral for nails/scalp).
- Rosacea: Characterized by central facial flushing and erythema, often triggered by spicy foods or alcohol; key differential from lupus is that the rash does not spare the nasolabial folds.
- Hidradenitis Suppurativa (HS): Affects apocrine sweat glands in intertriginous areas (axilla, groin); definitive treatment involves surgical excision, though antibiotics/TNF inhibitors may be used adjunctively.
Learning objectives
- Differentiate the clinical presentations and distributions of common inflammatory dermatoses (e.g., atopic dermatitis, psoriasis, lichen planus).
- Identify appropriate antifungal diagnosis and treatment based on KOH preparation findings and infection site.
- Recognize high-yield associations for specific rashes (e.g., Rosacea triggers, Psoriasis contraindications).
- Understand the pathophysiology and management of deep skin infections like Hidradenitis Suppurativa and acne vulgaris.
- Apply knowledge of differential diagnosis to distinguish between conditions with overlapping symptoms (e.g., Lupus vs. Rosacea).
Board exam buzzwords