be cool about the scar
joke about it
it isn't a turn-off in and of itself - it's your attitude about it
here's a story about the same thing
I worked with this great guy G. The only thing a bit off was the hair plugs. They were a bit too orderly. Looked like a tree yard. Anyway, I got used to them and his general personality made him amazing to be with.
Then one day, he starts calling people aside one by one. It was my turn.
Beth, I have something very important to tell you.
omg omg omg he's going to tell me he's dying and we never figured out what we were going to do
uhhhh I had a hair tranplant and I'm having it removed and I want to know that you're going to be ok with it.
I nearly punched him.
The balding didn't matter, the plugs didn't matter (but I was glad they were going away) and the scar never mattered.
He's a terrific guy with a shaved head now - and when I see him I still threaten to punch him for scaring me.