A laceration maybe differentiated from a incision by examining the edges, ends, hair&hair bulbs, the floor and underlying bone, with the help of a hand lense.       
  Laceration

Incision

Edges
  • Irregular
  • Abraded
  • Crushed
  • Contused      
  • Undermining of edges
  • Regular
  • Not abraded
  • Not contused
  • Not crushed
  • No undermining of edges

Ends

Irregular 

  Sharp pointed

Bleeding

Less due to crushed vessels

More due to cut vessels

Gaping

 More 

 Less

Walls

Tissue strands present across wall

Tissue strands are absent across wall

  Hair

Hair forced into wound 

 Hair cut clearly

If a bony base

May be fractured

Shows a clear cut