I know what you mean and I HATE it. My job involves constant physical work, so I don't really have much success with hiding my scar. Mine is a single dark, deep lash across my forearm, about an inch and a half long and a few millimeters wide. If someone were really looking, they'd be able to see many smaller, faint marks further up my arm, but they're barely noticeable in relation to the bigger one. I caught one of the new girls at work today staring at it...most of the older ladies ignore it altogether, though I know they've seen it too. I hate the thought of people thinking I've tried to commit s**c*de, but it's very possible they do.
Anyways, I guess I can't offer much more than empathy as I'm in the same boat, but know you're not the only person struggling with this. Most of us are.
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