## Distinguishing Flame Burns from Scalds ### Key Anatomical and Thermal Differences **Key Point:** Flame burns produce sharply demarcated margins with uniform depth, while scalds typically have irregular, poorly demarcated margins with variable depth due to the nature of heat transfer. ### Comparison Table | Feature | Flame Burn | Scald Injury | | --- | --- | --- | | **Margins** | Sharply demarcated | Irregular, poorly demarcated | | **Depth uniformity** | Uniform depth | Variable depth | | **Heat source** | Dry heat (direct flame) | Moist heat (liquid) | | **Cooling mechanism** | Slower cooling | Rapid cooling (liquid evaporates/runs off) | | **Surface pattern** | Often shows contact marks | Splash/spill pattern | | **Blistering** | Present (all depths) | Present (all depths) | | **Typical location** | Exposed surfaces, anterior trunk | Often flexor surfaces, lower limbs | ### Pathophysiology 1. **Flame burns**: Direct contact with high-temperature source (>100°C) causes coagulation necrosis with clear demarcation between burned and unburned tissue. 2. **Scalds**: Liquid heat transfer is interrupted when the liquid cools, runs off, or evaporates, creating irregular boundaries and variable depth within the same wound. **High-Yield:** The **sharply demarcated, uniform-depth margin** is the single best discriminating feature between flame and scald injuries in forensic examination. **Clinical Pearl:** Scalds are the most common burn injury in children (often from hot water immersion or spills), while flame burns predominate in adults and are associated with higher mortality due to greater total body surface area involvement. **Warning:** Both flame and scald injuries can present with blistering and erythema—these are NOT discriminating features. Involvement of flexor surfaces is more common in scalds but not exclusive.
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