Source / episode info
- **Episode:**246
- **Title:**Divine Intervention Episode 246 – USMLE Derm Review (Part 2 of 3).
- **Published:**2020-07-10
- Source:Episode page
One-liner
This episode provides a comprehensive review of high-yield dermatologic topics including Lyme disease, Herpes Zoster vaccine schedules, scabies/warts differentiation, the classic presentation and staging of BCC, SCC, and Melanoma (ABCD rule), management of drug hypersensitivity reactions (DRESS syndrome), and critical preventive measures for skin cancer.
High-yield summary
- Melanoma Assessment: Use the ABCDE criteria (Asymmetry, Border irregularity, Color variation, Diameter > 6mm, Evolution) to suspect melanoma; evolution is key over dysplastic nevus.
- BCC vs SCC: BCC is typically pink/pearly with telangiectasias and rolled borders; SCC is often ulcerated and may contain keratin pearls.
- Zoster Vaccines: The recombinant VZV vaccine (Shingrix) can be started as early as age 50, regardless of prior vaccination status. Live vaccines are generally reserved for immunocompetent individuals 60 years old.
- Infectious Syndromes: Jarisch-Herxheimer reaction is a non-allergic inflammatory response (fever/myalgia) that occurs hours after starting antibiotics for spirochetal infections; do not discontinue antibiotics.
- Skin Cancer Prevention: The primary preventive strategy against sun exposure is wearing protective clothing, not solely relying on sunscreen or avoiding the sun altogether.
- Drug Reactions: DRESS syndrome presents with fever, rash, and internal organ involvement (e.g., hepatitis) following drug initiation; treatment involves IV corticosteroids or IVIG.
Learning objectives
- Differentiate between various types of dermatologic malignancies (BCC, SCC, Melanoma) based on clinical presentation and biopsy findings.
- Apply knowledge of vaccine schedules for Herpes Zoster, recognizing the differences between recombinant and live attenuated vaccines.
- Recognize and manage systemic drug hypersensitivity reactions such as DRESS syndrome and Jarisch-Herxheimer reaction.
- Master the differential diagnosis of common skin lesions (e.g., Condyloma lata vs. acuminata; BCC vs. seborrheic keratosis).
- Understand the primary preventive measures for sun-induced skin cancers, emphasizing protective clothing over sunscreen alone.