The typical exit wound for a gunshot is distinguished from the entrance wound by the absence of a marginal rim of abrasion. If the exit wound is supported ("shored up") by a firm surface then a marginal rim of abrasion may develop.
Mechanism: If a firm surface is located at the point where the bullet exits, then the skin is pushed into the surface, which results in skin abrasions.
Structures that may reinforce the skin at the point of exit:
(1) floor
(2) wall
(3) column
(4) car body
(5) heavy leather belt
(6) tight body armor
The strength of the material determines what happens to the bullet after it leaves the body. The bullet may shatter, pass through, richochet or become embedded.
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