I downloaded a vampire follower mod. Since she used the same trick as Serana, I switched her race to NordRaceVampire due to me using Better Vampire Fangs and Eyes. But, as a result, the body's skin mismatches with the head's now.

I tried to export her facegen data, but nope, that didn't solve the problem. Any ideas?

setnpcweight 0 sometimes does the trick for me.

Also try resurrect