It only stands out to those who are trained and know what to look for. An average person isn't going to know about any CSA, but they may know that something is "off". I can tell when people have been abused if I am around them enough because there are certain tells, but I couldn't tell you what kind of abuse they suffered unless something they said or did made it obvious (flinched when I moved towards them indicating probable physical abuse, or saying certain manipulative things indicating emotional abuse, etc...).