@ is close, but everyone is throwing the word concealer around. You're all jumping the gun a bit here, but you guys are almost close...
@ would need to start with a corrector first, applied to the port wine stain, powder, then mix a tiny bit of concealer with a foundation, apply, then set with a powder.
If you use just a concealer then a foundation, you will still see the port wine stain over tone showing through. If you were to apply more concealer or foundation on to cover it, then it will start to look like a thick make-up patch.
The purpose of a corrector is to cover the 'over tone', or "correct" the over tone of the port wine stain, then you need to cover or "conceal" the under tone of the new layer of "skin tone" on the port wine stain, then you would apply your foundation as per usual, and of course powder to set between each layer.
This same technique was use on Robert Downey Jr. on Tropic Thunder (2008) turning him into a realistic looking African American male. The same technique can be used in reverse to turn an African American into a realistic looking Caucasian. A similar technique was on Keanu Reeves for Little Buddha (1993).
At any rate, all make-up artists have to do this corrective based make-up technique as part of their timed practical union make-up exam to become a union make-up artist. We don't use this application technique very much in fim / tv, but the point of this particular exercise is to know your over and under tones and your colour theory.
Anyways I digress... Remember, you don't have to do this all over your entire face, just over your port wine stain to make it look like the rest of your skin tone. And no, you don't need to be a pro MuA either, just practice, be patient with yourself and you'll nail it down.
Good Luck.
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