Petechial Haemorrhage
Definition
Tiny pinpoint bleeds within the skin, sometimes visible inside the bite circle as a result of suction. Their presence can help confirm that a pattern is a bite rather than another rounded injury.
- Cause
- Suction force applied during biting
- Location
- Within the bite mark circle
- Diagnostic role
- Helps confirm a pattern is a bite rather than a blunt injury
- Depth
- Intradermal capillary rupture
Common questions
What other injuries can be mistaken for a suction-related bite mark?+
Blunt trauma such as a pinch, a fall onto a rounded object, or certain insect bites can leave rounded bruising patterns, so examiners look at the arch shape and tooth-spacing detail alongside any petechiae rather than relying on petechiae alone.
Does the absence of petechiae rule out a bite mark?+
No. Suction intensity varies between biting incidents, and a light or brief bite may leave a recognisable dental pattern without generating visible petechial haemorrhage, so absence is not conclusive against a bite.
Related terms
- Class Characteristics
- Features deliberately or systematically imparted to a group of items by design or manufacture, such as the calibre of a bullet, the...
- Contusion
- Bruising without a break in the skin surface. Many bite marks present as contusion patterns: paired arches of discolouration with no laceration....
- Dental Arch
- The curved row of teeth in the upper (maxillary) or lower (mandibular) jaw. The shape and width of each arch is partly...
- Individual Characteristics
- Surface features on a fired bullet or cartridge case that arise from random or unique events (tool wear, corrosion, service damage) and...
- Viscoelasticity
- Skin's combined elastic (spring-back) and viscous (flow) behavior under stress. Because skin is viscoelastic, it deforms under biting pressure in ways that...