Scars begin as dark pink, but the older they are, the more they take on the natural skin tone.
The shape of it is another issue however... The best way would probably be to first make a "back up copy" of the original sculpt and work with that if you aren't sure how it will turn out.
It's hard to say if a scar should be an outie or an innie - it seems most wounds that doesn't heal that ok becomes an innie (a valley scar), while treated wounds (sewn up) might become outies. This also depends on where the wound is - I think that if a smooth surface (like most of the face) gets the wound the scar will be an innie, but if its around a joint, it will become an outie.
I cut my knuckle quite badly once so that it left a thick skin flap - under it I could see muscle tissue and I small white worm I swear was a nerve (unless of course I stumbled on the fact that I'm currently dead and decomposing and I disturbed a worm in his meal). I didn't bother going to get it sewn up, but just covered it with gauze and home medical stuff. It healed fine, but now I do have an outie scar right there.
