Scars are visible reminders of the past.
Sometimes that can actually be reassuring as it does indeed suggest that it was real, that time has passed and the person has healed.
But what if the scars are not visible? What if the trauma and pain was emotional? Or verbal? Or was about what was not given, as in neglect?
Unfortunately, in my experience others tend to minimize this type of harm, both societies at large and the person who has experienced it. They question their perception of how bad things actually were. They question whether it even counts as abuse or trauma.
And that hinders getting help and healing. But these are all types of trauma, these are all legitimately hurtful and harmful. It is okay if your understanding of your childhood or relationships is different than it appeared to others. It is your reality.