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How far along are you with this painting? just started . . . half way . . . almost finished? Where is the black passage? Somewhere it can be wiped down and allowed to dry for awhile. Did you use straight black?
My experience is that there are few places, except the pupils of the eye that are totally black. Of course, I tend to use Liquin, which will dry up the ocean (joke) I think. But, if you use oil as your medium, you could do several things, such as manufacture a black from something like burnt umber and a deep blue. Burnt umber dries quickly. For a warm black you could use burnt sienna and black . . . the burnt sienna dried rather quickly.
It it were me, and the painting was not finished, I would wipe it down and repaint that passage. You say you don't want to ruin the expression on the face . . . did you use that much black in the face?
Again, from my experience, black of any kind, if I'm going to use it at all, is best used in small amounts to tone down another color, in which case, the other colors it is mixed with will dry sooner, pulling the black along with it to a dry condition.
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