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I really messed up on one specific area on my sergeant... and I don't want to have to strip the whole thing and restart. How could I strip only one specific section of a mini? It's a skull on the neck armor of the sergeant torso... So It's an inch by inch area, if not even less.

Well... is painting over it an option? I think we need more details on how you messed up.

For example, if you painted it too thick, then painting over it really isn't an option.

If you messed up on a wash or something, you could probably paint over it in some think layers to get it back to it's starting color and try again.

I painted it and the paint kind of globbed into the recesses, filling them, but not sinking into them... So there's a silver blob on his neck, since you can't see the eyes of the skull

Hm... maybe you can get a needle and try to scrape the paint out?

Air Eraser.

http://www.amazon.com/Paasche-AEC-K-Air-Eraser-Kit/dp/B0001I2ASG

That is just an example of one - there are a half dozen brands which I am familiar with. They are excellent for this task. With practice, you can use it to remove just a tiny area down to bare blastic/metal...remove things like lettering from existing models (model train guys use them to remove the letters from train cars to change them without damaging the underlying paint job)...and doing things like fading paint jobs for weathering and the like.

It is a mini-sandblaster, so you will have some issues related to that (lots of dust and stuff) - so either outside or in an enclosure which is purpose built. Different media types will cut slower or faster and allows you to fine tune your needs. Because it is fairly gentle - you can go through and use eraser shields and airbrush masks to mark off areas which you want to protect (so you can go through and strip the paint off from only the center of a wheel for example).

Should be plenty of You-tube videos demonstrating the use and techniques if you are more interested.

Rubbing alcohol. Nothing fancy, just the plain old 70% isopropyl you can pick up at any drug store or supermarket in the US. Load up a crappy old brush, dab it on the offending area and let it sit for a minute. Load your brush again, lightly, and gently scrub the area - the paint will come right off, if you haven't varnished, yet. If you've used more resilient paints and/or overcoats, it may take a bit more time and agitation, but it will spot-strip just fine.

I use dilute paints applied in numerous layers and I had to stop using rubbing alcohol to make pigment washes, as I would end up stripping areas that weren't varnished, even with very gentle brushwork. It didn't touch the spray paint undercoat, though, unless I worked at it more vigorously. Seems perfect for your task, and far cheaper/easier to use than a miniature sandblaster.