## Preferred Burrow Sites in Scabies ### Classic Distribution Pattern **Key Point:** The interdigital spaces (between fingers and toes) are the most common and characteristic sites of burrow formation in scabies. ### Primary Burrow Locations | Site | Frequency | Clinical Note | |------|-----------|---------------| | Interdigital spaces | Most common | Pathognomonic finding | | Wrists | Very common | Flexor surfaces | | Elbows | Common | Extensor surfaces | | Axillae | Common | Intertriginous areas | | Genitalia | Common in males | Penile shaft, scrotum | | Buttocks | Moderate | Especially in females | | Breasts | Moderate | Inframammary fold | | Feet | Common | Soles, heel, lateral border | ### Why Interdigital Spaces? 1. **Warm, moist environment** — optimal for mite survival 2. **Thin stratum corneum** — easier for female mite to burrow 3. **Friction-prone area** — mechanical irritation enhances infestation 4. **Occlusion** — reduced air circulation favors parasites **High-Yield:** The **interdigital burrows** are the most diagnostic finding; their presence virtually confirms scabies diagnosis. ### Atypical Presentations - **Nodular scabies:** Burrows on genitalia, buttocks, axillae (hypersensitivity reaction) - **Crusted scabies (Norwegian scabies):** Widespread involvement including palms, soles, and trunk (immunocompromised patients) - **Infants and young children:** May show involvement of palms, soles, and face (unusual distribution) **Clinical Pearl:** Always examine interdigital spaces first when scabies is suspected; finding a burrow here is highly specific for diagnosis. 
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