A scar is a healed wound that still shows, read as memory of past hurt and proof of having come through it. Dream books see it as experience that has become part of you. Finding a new scar points to a recent pain you have not fully acknowledged, while an old scar opening again suggests a past matter returning. Hiding a scar is read as shame about your history; showing it, as acceptance. It can help to ask which old story is on your mind lately.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.