This disadvantage comes in two versions:
Furtive
When someone catches a glimpse of you out of the corner of their eye, they could have sworn you have pointed ears..When encountering you with your ears uncovered for the first time, a person may roll against Per-2. On a fail, they don't notice. On a success, they briefly notice, but only out of the corner of their eye. On a critical success, they can see your pointed ears even when looking straight at you.
If you confirm for someone that your ears are pointed, or if they learn of your true nature, they can see them permanently.