You can start with a partial unit but you will probably need some Dermmatch or Couvre for the sides.

Messing with concealers gets old pretty quickly though so don't be afraid to go with a full cap or even a 3/4 if you aren't able to achieve the look you want or. The old way of thinking was that a full cap was a "last resort", but that is simply not the case. There are still a lot of myths about full caps floating around, but that is slowly going the way of the horse and buggy as we continue to push the limits.