In college my psych of abnormality prof was covered in scars that she didn't try to hide. I grew to really respect her, she'd been through a lot. Of course, my first thought was "wow this lady really needs this class, can't believe she's the prof." She was covered. It's how I remember her even to this day.

I would cover them up at least at first until a client gets to know you. My current t has no scars but I've come to learn he has faced issues and I appreciate that he's had some real life experience to share.