PART 1 — SCALP & HAIR
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Study use: Rapid anatomy, dermatology, pediatrics, and emergency revision. Management is intentionally concise; use clinical context when applying treatment details.
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Priority Guide: 🔴 Core / Must Know | 🟠 Important | 🟡 Additional
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🎯 High-Yield Overview
- SCALP layers: Skin → dense Connective tissue → Aponeurosis → Loose areolar tissue → Pericranium
- Dangerous scalp layer: loose areolar tissue → emissary veins → dural venous sinuses
- Gaping scalp wound: galea aponeurotica divided; profuse bleeding occurs because vessels are fixed open in dense connective tissue
- Alopecia areata: smooth non-scarring patch + exclamation-mark hairs ± nail pitting
- Tinea capitis: scale + broken hairs/black dots ± cervical/postauricular nodes; requires systemic antifungal therapy
- Kerion: tender boggy inflammatory tinea capitis; do not treat it as a routine bacterial abscess
- Chemotherapy: anagen effluvium; postpartum/illness/stress with delayed shedding: telogen effluvium
- Irregular patches + hairs of different lengths: trichotillomania; trichophagia can cause trichobezoar/Rapunzel syndrome
- Greasy yellow-white scale: seborrheic dermatitis; silvery well-demarcated plaque: psoriasis
- Vacuum-assisted delivery + diffuse scalp swelling + pallor/shock: subgaleal hemorrhage
- Does not cross sutures: cephalohematoma; crosses sutures + benign edema at birth: caput succedaneum
- Scalp nodule without punctum: pilar/trichilemmal cyst; perifollicular scale + loss of follicular openings: lichen planopilaris
1. SCALP ANATOMY & LACERATION
2. ALOPECIA & HAIR-LOSS DISORDERS
3. INFECTIOUS SCALP DISORDERS
4. INFLAMMATORY & SCALY SCALP DISORDERS