🔍 Chapter 686: Dermatologic Evaluation of the Patient

Nelson Textbook of Pediatrics 22nd Edition | Systematic approach to skin disorders — primary vs secondary lesions, biopsy techniques (shave/punch), Wood lamp, KOH preparation, Tzanck smear, direct/indirect immunofluorescence. Plus cutaneous manifestations of systemic diseases (SLE, JDM, vasculitis, IBD, Sweet syndrome, GVHD, drug eruptions).

🌐 paeds.online — Pediatric Learning Platform

📋 30 Clinical Scenarios — Dermatologic Evaluation & Systemic Signs

📇 High‑Yield Review Cards | Skin Exam & Diagnostics

🩺 Morphology‑Driven Approach

Select a lesion type or diagnostic tool to review definition and clinical pearl.

📋 Stepwise Dermatologic Evaluation

🔑 Key Principles — Nelson Chapter 686
• Primary lesions: Macule, papule, patch, plaque, nodule, tumor, vesicle, bulla, pustule, wheal, cyst.
• Secondary lesions: Scale, crust, erosion, ulcer, excoriation, fissure, scar, lichenification.
• Diagnostic tools: Wood lamp (fungal fluorescence, pigment), KOH (dermatophytes), Tzanck (HSV/VZV giant cells, pemphigus), immunofluorescence (autoimmune blistering).
• Biopsy types: Shave (superficial raised lesions), punch (full thickness, dermis/subcutis).
• Systemic clues: Malar rash (SLE), Gottron papules (JDM), palpable purpura (IgA vasculitis), target lesions (EM), acrodermatitis enteropathica‑like (zinc).

    ⚡ Reflex Prompts — Clinical Decisions

    📖 Summary: Dermatologic Evaluation (Nelson 686)