Contusions (Bruises): Forensic Essentials
Forensic Pathology: Blunt Force Trauma
1. Clinical Definition
A contusion is a localized area of hemorrhage into soft tissue caused by the rupture of blood vessels due to blunt force impact. The skin is typically intact, although the underlying tissue is damaged.
2. Evolution of Color (Estimated Age)
| Color | Approximate Age |
|---|---|
| Red / Dark Blue / Purple | Immediately / Few hours |
| Violet / Blue / Black | 1–3 days |
| Green | 4–7 days |
| Yellow / Brown | 7–14 days (then fades) |
3. Forensic High-Yield Pearls
- Patterned Contusions: Like abrasions, contusions may reproduce the pattern of the object (e.g., parallel tramline bruises from a baton).
- Deep Contusions: Large, severe impacts may cause deep-tissue bruising that does not reach the skin surface for several days (delayed appearance), or may never surface at all.
- Post-Mortem Bruising: Distinguishing between ante-mortem bruises and post-mortem lividity (hypostasis) is critical. A bruise is firmer, involves tissue staining, and cannot be blanched by pressure; hypostasis is dependent, settles in lower areas, and blanches under pressure.
- Ectopic Bruising: Gravitational settling of blood from a distant injury (e.g., a scalp injury causing bruising around the eyes).