Hello kaskyron and Welcome to the NeuroTalk community
My hands get very cold when I go outside, but for me it is both hands not just one finger.
The reason my hands get cold and stay cold is because I have something called Raynaud's Phenomenon.
I dont know if raynauds can happen to just one finger, most of the things I have read about it talk about the hands... but below is a link for you to info about raynauds.
raynauds info-
http://www.niams.nih.gov/hi/topics/raynaud/ar125fs.htm
I don't know if that will help you or not - maybe someone else will have another idea.
Welcome to NeuroTalk

Take care,
Liz
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