Had a thought " a rare event I know" about skull caps.

If ya model the hair line in to the main mesh.

 

1. ya could name that part of the mesh "skull cap hair line "

then have the hair not collide with  "skull cap hair line " part of the mesh.

 

2. just not have a mesh there. then insert deferent skull caps to fill in the hole.

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Dark Sphere Mage Vengeance