Hey,
Perhaps it's due the really laid back attitude at my lab but, as far as I know, the worst thing that can happen after spilling a little acetone on your skin is getting dry skin.
I've done it plenty of times and know people who have done it plenty of times, and don't know of anything other than dry skin as a consequence. You should consult MSDS, though, to be sure.
Cheers,
Stef