I have one on my left hand. Right handed, don't know if that makes a difference or not.
Somewhat related to this I suppose, I've read that autism is somewhat strongly correlated with clinodactyly (bent or crooked fingers), particularly of the pinky finger. I have clinodactyly (informally confirmed by a former associate of mine who happens to be a hand surgeon) of both the pinky and index fingers on both hands, more pronounced on the left hand.
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From start to finish I've made you feel this
Uncomfort in turn with the world you've learned
To love through this hate to live with its weight
A burden discerned in the blood you taste