Scars Run Deep
Bane originated as a member of the League of Shadows, but he was ultimately excommunicated by the organization’s former leader. If you look closely at his bald head in The Dark Knight Rises, you’ll notice that the scars there actually mean something.
To casual viewers, the scars might’ve just been a remnant of his brutal past, but upon closer inspection, and with a bit of knowledge about the League of Shadows, the marks clearly resemble the organization’s symbol. The League of Shadow’s primary goal is to eradicate the world of corruption by any means necessary, including murdering and infiltrating nearly any aspect of ordinary life.