Scar
To dream of a scar represents pain, struggles, or a negative experience that you can never forget. Negative emotions or memories that linger. Never being able to forget how bad something was for you.
Negatively, you may be living too much in the past or allowing it to influence your present life.
Example: A man dreamed of seeing scars on a man's back. In waking life she was afraid to ask his wife for sex because she was very sensitive about past sexual trauma.
Example 2: A man dreamed of seeing an enormous scar on a man's back. In waking life he had endured a very powerful spiritual test that was so traumatizing he could never forget it.