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Look up a disease called Reynauds. This could possibly be the cause, as my girlfriend was recently diagnosed with reynauds. reynauds in and of itself is generally harmless, but 20% of those who have it usually end up with a more serious disorder such as lupus. If your fingers / toes (extremities) get cold and/or change to a purplish color (like your fingernails) at the slighest drop in temperature, then you most likely have reynauds. if this doesn't fit your description, I wouldn't worry about it.
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