oh, no, that's fine.  i'm just trying to figure out what problem you're encountering.  if it's actually where the lips have their edge and you're working with just your own, from scratch texture, you might want to look at  a V4 seam guide.  if you're using  a kit, though, it's probably placed the textured edge of the lips close to that seam but in an arbitrary position.  basically wherever Luciferino chose. if you're altering the mask to work with the texture in regards to where the lips are, and not altering the texture to work with the mask, then you might as well use the texture to create the mask.