Blue sharpie (two colors) bleeds a little bit when applied and will smudge if I rub it hard enough with my fingers. But it didn't shift under clothing.

Blue sharpie paint (and odd stuff it is) isn't quite the right color, darn it, but didn't bleed or smudge and didn't shift under clothing.

Wolffe Brother's skin paint with Ben Nye Sealant didn't bleed, smudge or shift and has the added benefit of washing off completely when I want it to.

Guess I am back to the paint-and-sealant plan.