**Core Concept**
The question tests the understanding of **forensic pathology**, specifically the distinction between **contusion** (a type of injury) and **post-mortem lividity** (a change occurring after death).

**Why the Correct Answer is Right**
Post-mortem lividity, also known as livor mortis, is the settling of blood in the dependent parts of the body after death, due to gravity. It is not a fixed stain and can change location if the body position is altered.

**Why Each Wrong Option is Incorrect**
**Option A:** No information is provided to assess this option.
**Option B:** No information is provided to assess this option.
**Option C:** No information is provided to assess this option.
Given the lack of options, the key distinction to remember is that post-mortem lividity is not a fixed lesion and does not involve bleeding into tissues as seen in a contusion.

**Clinical Pearl / High-Yield Fact**
A crucial point to remember is that post-mortem lividity can be distinguished from a contusion by its ability to change location with a change in body position and by the lack of associated tissue damage.

**Correct Answer:** D. does not involve hemorrhage into tissues.