Raynaud's phenomenon: This is a condition of vascular instability triggered by cold exposure. It is characterized by rapid changes when exposed to cold causing the digits initially to turn white, then blue, and upon rewarming - red. It can be related to autoimmune diseases such as lupus so you should see your doctor for blood tests to check for it. If all is good, ask about taking a calcium channel block-nifedipine.
Answered 9/28/2016
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