The meaning of scar dream is that you have a past.
If you see a scar on someone else, it means that person has a past. The scar is a dream symbol that means past history is hidden. It warns you to be aware. A person with hidden agenda may suddenly strike out to harm you.
The meaning of scar dream can also be used to decipher the dream symbol of a birthmark. According to definition, the dream metaphor of birthmark refers to the traditional heritage of the person.