I've had a problem with this as well, not just on Antonia.

For Antonia I find that when I use a natural lip color and on the face map with a little skin color surrounding the lips, it works very well.

But when I change lip color I get the white edge around the lips.

I'm still working on it and if I succeed in doing it right, I'll post how I did it.

Or we could maybe get Robynsveil or Saintfox to share their technique. :)

Let me introduce you to my multiple personalities. :)
     BluEcho...Faery_Light...Faery_Souls.